Action not permitted
Modal body text goes here.
Modal Title
Modal Body
Vulnerability from cleanstart
Published
2026-05-21 08:10
Modified
2026-05-20 18:50
Summary
Security fixes for CVE-2025-61726, CVE-2025-61728, CVE-2025-61730, CVE-2025-61732, CVE-2025-68119, CVE-2025-68121, CVE-2026-25679, CVE-2026-27139, CVE-2026-27142, CVE-2026-33811, CVE-2026-33814, CVE-2026-39817, CVE-2026-39819, CVE-2026-39820, CVE-2026-39823, CVE-2026-39825, CVE-2026-39826, CVE-2026-39836, CVE-2026-42499, CVE-2026-42501 applied in versions: 0.87.1-r0, 0.89.0-r0, 0.90.1-r0
Details
Multiple security vulnerabilities affect the prometheus-operator package. These issues are resolved in later releases. See references for individual vulnerability details.
References
{
"affected": [
{
"package": {
"ecosystem": "CleanStart",
"name": "prometheus-operator"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.90.1-r0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"credits": [],
"database_specific": {},
"details": "Multiple security vulnerabilities affect the prometheus-operator package. These issues are resolved in later releases. See references for individual vulnerability details.",
"id": "CLEANSTART-2026-CH40794",
"modified": "2026-05-20T18:50:44Z",
"published": "2026-05-21T08:10:56.446075Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-CH40794.json"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61726"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61728"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61730"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-61732"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-68119"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2025-68121"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-25679"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-27139"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-27142"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-33811"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-33814"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39817"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39819"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39820"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39823"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39825"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39826"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-39836"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42499"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-42501"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61726"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61728"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61730"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-61732"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68119"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68121"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25679"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27139"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27142"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33811"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33814"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39817"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39819"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39820"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39823"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39825"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39826"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39836"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42499"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42501"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes for CVE-2025-61726, CVE-2025-61728, CVE-2025-61730, CVE-2025-61732, CVE-2025-68119, CVE-2025-68121, CVE-2026-25679, CVE-2026-27139, CVE-2026-27142, CVE-2026-33811, CVE-2026-33814, CVE-2026-39817, CVE-2026-39819, CVE-2026-39820, CVE-2026-39823, CVE-2026-39825, CVE-2026-39826, CVE-2026-39836, CVE-2026-42499, CVE-2026-42501 applied in versions: 0.87.1-r0, 0.89.0-r0, 0.90.1-r0",
"upstream": [
"CVE-2025-61726",
"CVE-2025-61728",
"CVE-2025-61730",
"CVE-2025-61732",
"CVE-2025-68119",
"CVE-2025-68121",
"CVE-2026-25679",
"CVE-2026-27139",
"CVE-2026-27142",
"CVE-2026-33811",
"CVE-2026-33814",
"CVE-2026-39817",
"CVE-2026-39819",
"CVE-2026-39820",
"CVE-2026-39823",
"CVE-2026-39825",
"CVE-2026-39826",
"CVE-2026-39836",
"CVE-2026-42499",
"CVE-2026-42501"
]
}
CVE-2026-33814 (GCVE-0-2026-33814)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 18:01
VLAI?
EPSS
Title
Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net
Summary
When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.
Severity ?
7.5 (High)
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| golang.org/x/net | golang.org/x/net/http2 |
Affected:
0 , < 0.53.0
(semver)
|
|
| Go standard library | net/http |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Marwan Atia (marwansamir688@gmail.com)
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-33814",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T18:00:53.951676Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T18:01:02.989Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "golang.org/x/net/http2",
"product": "golang.org/x/net/http2",
"programRoutines": [
{
"name": "clientConnReadLoop.processSettingsNoWrite"
},
{
"name": "Transport.NewClientConn"
},
{
"name": "Transport.RoundTrip"
},
{
"name": "Transport.RoundTripOpt"
},
{
"name": "clientConnPool.GetClientConn"
},
{
"name": "noDialClientConnPool.GetClientConn"
},
{
"name": "noDialH2RoundTripper.NewClientConn"
},
{
"name": "noDialH2RoundTripper.RoundTrip"
},
{
"name": "unencryptedTransport.RoundTrip"
}
],
"vendor": "golang.org/x/net",
"versions": [
{
"lessThan": "0.53.0",
"status": "affected",
"version": "0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net/http",
"product": "net/http",
"programRoutines": [
{
"name": "http2clientConnReadLoop.processSettingsNoWrite"
},
{
"name": "Client.CloseIdleConnections"
},
{
"name": "Client.Do"
},
{
"name": "Client.Get"
},
{
"name": "Client.Head"
},
{
"name": "Client.Post"
},
{
"name": "Client.PostForm"
},
{
"name": "ClientConn.Close"
},
{
"name": "ClientConn.RoundTrip"
},
{
"name": "Get"
},
{
"name": "Head"
},
{
"name": "Post"
},
{
"name": "PostForm"
},
{
"name": "Transport.CloseIdleConnections"
},
{
"name": "Transport.NewClientConn"
},
{
"name": "Transport.RoundTrip"
},
{
"name": "http1ClientConn.Close"
},
{
"name": "http1ClientConn.RoundTrip"
},
{
"name": "http2Transport.NewClientConn"
},
{
"name": "http2Transport.RoundTrip"
},
{
"name": "http2Transport.RoundTripOpt"
},
{
"name": "http2clientConnPool.GetClientConn"
},
{
"name": "http2noDialClientConnPool.GetClientConn"
},
{
"name": "http2noDialH2RoundTripper.NewClientConn"
},
{
"name": "http2noDialH2RoundTripper.RoundTrip"
},
{
"name": "http2unencryptedTransport.RoundTrip"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Marwan Atia (marwansamir688@gmail.com)"
}
],
"descriptions": [
{
"lang": "en",
"value": "When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:17.631Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/761581"
},
{
"url": "https://go.dev/cl/761640"
},
{
"url": "https://go.dev/issue/78476"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4918"
}
],
"title": "Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-33814",
"datePublished": "2026-05-07T19:41:17.631Z",
"dateReserved": "2026-03-23T20:35:32.814Z",
"dateUpdated": "2026-05-08T18:01:02.989Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39817 (GCVE-0-2026-39817)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI?
EPSS
Title
Invoking "go tool pack" does not sanitize output paths in cmd/go
Summary
The "go tool pack" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the "pack" subcommand can write files to arbitrary locations on the filesystem.
Severity ?
5.9 (Medium)
CWE
- CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Harshit Gupta (Mr HAX)
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39817",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T16:58:23.255142Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T21:29:47.246Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Harshit Gupta (Mr HAX)"
}
],
"descriptions": [
{
"lang": "en",
"value": "The \"go tool pack\" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the \"pack\" subcommand can write files to arbitrary locations on the filesystem."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:18.993Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78778"
},
{
"url": "https://go.dev/cl/767520"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4979"
}
],
"title": "Invoking \"go tool pack\" does not sanitize output paths in cmd/go"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39817",
"datePublished": "2026-05-07T19:41:18.993Z",
"dateReserved": "2026-04-07T18:13:03.524Z",
"dateUpdated": "2026-05-08T21:29:47.246Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39819 (GCVE-0-2026-39819)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI?
EPSS
Title
Invoking "go bug" follows symlinks in predictable temporary filenames in cmd/go
Summary
The "go bug" command writes to two files with predictable names in the system temporary directory (for example, "/tmp"). An attacker with access to the temporary directory can create a symlink in one of these names, causing "go bug" to overwrite the target of the symlink.
Severity ?
5.3 (Medium)
CWE
- CWE-377 - Insecure Temporary File
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Harshit Gupta (Mr HAX)
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39819",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T16:56:43.015860Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T21:29:53.674Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Harshit Gupta (Mr HAX)"
}
],
"descriptions": [
{
"lang": "en",
"value": "The \"go bug\" command writes to two files with predictable names in the system temporary directory (for example, \"/tmp\"). An attacker with access to the temporary directory can create a symlink in one of these names, causing \"go bug\" to overwrite the target of the symlink."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-377: Insecure Temporary File",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:18.849Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78584"
},
{
"url": "https://go.dev/cl/763882"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4978"
}
],
"title": "Invoking \"go bug\" follows symlinks in predictable temporary filenames in cmd/go"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39819",
"datePublished": "2026-05-07T19:41:18.849Z",
"dateReserved": "2026-04-07T18:13:03.526Z",
"dateUpdated": "2026-05-08T21:29:53.674Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39820 (GCVE-0-2026-39820)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:27
VLAI?
EPSS
Title
Quadratic string concatentation in consumeComment in net/mail
Summary
Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/mail |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
thatnealpatel
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39820",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T14:27:51.595266Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T14:27:54.923Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net/mail",
"product": "net/mail",
"programRoutines": [
{
"name": "addrParser.consumeComment"
},
{
"name": "AddressParser.Parse"
},
{
"name": "AddressParser.ParseList"
},
{
"name": "Header.AddressList"
},
{
"name": "Header.Date"
},
{
"name": "ParseAddress"
},
{
"name": "ParseAddressList"
},
{
"name": "ParseDate"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "thatnealpatel"
}
],
"descriptions": [
{
"lang": "en",
"value": "Well-crafted inputs reaching ParseAddress, ParseAddressList, and ParseDate were able to trigger excessive CPU exhaustion and memory allocations."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-407: Inefficient Algorithmic Complexity",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:19.854Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78566"
},
{
"url": "https://go.dev/cl/759940"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4986"
}
],
"title": "Quadratic string concatentation in consumeComment in net/mail"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39820",
"datePublished": "2026-05-07T19:41:19.854Z",
"dateReserved": "2026-04-07T18:13:03.526Z",
"dateUpdated": "2026-05-08T14:27:54.923Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39823 (GCVE-0-2026-39823)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:05
VLAI?
EPSS
Title
Bypass of meta content URL escaping causes XSS in html/template
Summary
CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.
Severity ?
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Samy Ghannad
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39823",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T14:05:34.310805Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T14:05:55.152Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "html/template",
"product": "html/template",
"programRoutines": [
{
"name": "tMetaContent"
},
{
"name": "Template.Execute"
},
{
"name": "Template.ExecuteTemplate"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Samy Ghannad"
}
],
"descriptions": [
{
"lang": "en",
"value": "CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a \u003cmeta\u003e tag\u0027s \u003ccontent\u003e attribute. If the URL content were to insert ASCII whitespaces around the \u0027=\u0027 rune inside of the \u003ccontent\u003e attribute, the escaper would fail to similarly escape it, leading to XSS."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:19.524Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78913"
},
{
"url": "https://go.dev/cl/769920"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4982"
}
],
"title": "Bypass of meta content URL escaping causes XSS in html/template"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39823",
"datePublished": "2026-05-07T19:41:19.524Z",
"dateReserved": "2026-04-07T18:13:03.527Z",
"dateUpdated": "2026-05-08T14:05:55.152Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39825 (GCVE-0-2026-39825)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:30
VLAI?
EPSS
Title
ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil
Summary
ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewrite function, or a Director function which parses query parameters, ReverseProxy sanitizes the forwarded request to remove query parameters which are not parsed by url.ParseQuery. ReverseProxy does not take ParseQuery's limit on the total number of query parameters (controlled by GODEBUG=urlmaxqueryparams=N) into account. This can permit ReverseProxy to forward a request containing a query parameter that is not visible to the Rewrite function. For example, the query "a1=x&a2=x&...&a10000=x&hidden=y" can forward the parameter "hidden=y" while hiding it from the proxy's Rewrite function.
Severity ?
5.3 (Medium)
CWE
- CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/http/httputil |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39825",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T16:46:43.329507Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T21:30:08.872Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net/http/httputil",
"product": "net/http/httputil",
"programRoutines": [
{
"name": "cleanQueryParams"
},
{
"name": "ReverseProxy.ServeHTTP"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "ReverseProxy can forward queries containing parameters not visible to Rewrite functions. When used with a Rewrite function, or a Director function which parses query parameters, ReverseProxy sanitizes the forwarded request to remove query parameters which are not parsed by url.ParseQuery. ReverseProxy does not take ParseQuery\u0027s limit on the total number of query parameters (controlled by GODEBUG=urlmaxqueryparams=N) into account. This can permit ReverseProxy to forward a request containing a query parameter that is not visible to the Rewrite function. For example, the query \"a1=x\u0026a2=x\u0026...\u0026a10000=x\u0026hidden=y\" can forward the parameter \"hidden=y\" while hiding it from the proxy\u0027s Rewrite function."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:18.453Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/770541"
},
{
"url": "https://go.dev/issue/78948"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4976"
}
],
"title": "ReverseProxy forwards queries with more than urlmaxqueryparams parameters in net/http/httputil"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39825",
"datePublished": "2026-05-07T19:41:18.453Z",
"dateReserved": "2026-04-07T18:13:03.527Z",
"dateUpdated": "2026-05-08T21:30:08.872Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39826 (GCVE-0-2026-39826)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 14:05
VLAI?
EPSS
Title
Escaper bypass leads to XSS in html/template
Summary
If a trusted template author were to write a <script> tag containing an empty 'type' attribute or a 'type' attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the <script> block.
Severity ?
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Mundur (https://github.com/M0nd0R)
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39826",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T14:04:40.842823Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T14:05:05.849Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "html/template",
"product": "html/template",
"programRoutines": [
{
"name": "isJSType"
},
{
"name": "Template.Execute"
},
{
"name": "Template.ExecuteTemplate"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Mundur (https://github.com/M0nd0R)"
}
],
"descriptions": [
{
"lang": "en",
"value": "If a trusted template author were to write a \u003cscript\u003e tag containing an empty \u0027type\u0027 attribute or a \u0027type\u0027 attribute with an ASCII whitespace, the execution of the template would incorrectly escape any data passed into the \u003cscript\u003e block."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:19.138Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78981"
},
{
"url": "https://go.dev/cl/771180"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4980"
}
],
"title": "Escaper bypass leads to XSS in html/template"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39826",
"datePublished": "2026-05-07T19:41:19.138Z",
"dateReserved": "2026-04-07T18:13:03.528Z",
"dateUpdated": "2026-05-08T14:05:05.849Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-39836 (GCVE-0-2026-39836)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:30
VLAI?
EPSS
Title
Panic in Dial and LookupPort when handling NUL byte on Windows in net
Summary
The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0).
Severity ?
7.5 (High)
CWE
- CWE-248 - Uncaught Exception
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-39836",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T16:36:25.079035Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T21:30:15.127Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net",
"product": "net",
"programRoutines": [
{
"name": "Resolver.lookupPort"
},
{
"name": "Resolver.lookupAddr"
},
{
"name": "Resolver.lookupTXT"
},
{
"name": "Resolver.lookupNS"
},
{
"name": "Resolver.lookupMX"
},
{
"name": "Resolver.lookupSRV"
},
{
"name": "Dial"
},
{
"name": "DialTimeout"
},
{
"name": "Dialer.Dial"
},
{
"name": "Dialer.DialContext"
},
{
"name": "Listen"
},
{
"name": "ListenConfig.Listen"
},
{
"name": "ListenConfig.ListenPacket"
},
{
"name": "ListenPacket"
},
{
"name": "LookupAddr"
},
{
"name": "LookupCNAME"
},
{
"name": "LookupHost"
},
{
"name": "LookupIP"
},
{
"name": "LookupMX"
},
{
"name": "LookupNS"
},
{
"name": "LookupPort"
},
{
"name": "LookupSRV"
},
{
"name": "LookupTXT"
},
{
"name": "ResolveIPAddr"
},
{
"name": "ResolveTCPAddr"
},
{
"name": "ResolveUDPAddr"
},
{
"name": "Resolver.LookupAddr"
},
{
"name": "Resolver.LookupCNAME"
},
{
"name": "Resolver.LookupHost"
},
{
"name": "Resolver.LookupIP"
},
{
"name": "Resolver.LookupIPAddr"
},
{
"name": "Resolver.LookupMX"
},
{
"name": "Resolver.LookupNS"
},
{
"name": "Resolver.LookupNetIP"
},
{
"name": "Resolver.LookupPort"
},
{
"name": "Resolver.LookupSRV"
},
{
"name": "Resolver.LookupTXT"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "The Dial and LookupPort functions panic on Windows when provided with an input containing a NUL (0)."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-248: Uncaught Exception",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:18.300Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/79006"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://go.dev/cl/775320"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4971"
}
],
"title": "Panic in Dial and LookupPort when handling NUL byte on Windows in net"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-39836",
"datePublished": "2026-05-07T19:41:18.300Z",
"dateReserved": "2026-04-07T18:13:03.529Z",
"dateUpdated": "2026-05-08T21:30:15.127Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42499 (GCVE-0-2026-42499)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 21:29
VLAI?
EPSS
Title
Quadratic string concatenation in consumePhrase in net/mail
Summary
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
Severity ?
7.5 (High)
CWE
- CWE-407 - Inefficient Algorithmic Complexity
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go standard library | net/mail |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42499",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T16:55:28.873015Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T21:29:59.662Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "net/mail",
"product": "net/mail",
"programRoutines": [
{
"name": "addrParser.consumePhrase"
},
{
"name": "AddressParser.Parse"
},
{
"name": "AddressParser.ParseList"
},
{
"name": "Header.AddressList"
},
{
"name": "ParseAddress"
},
{
"name": "ParseAddressList"
}
],
"vendor": "Go standard library",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-407: Inefficient Algorithmic Complexity",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:18.615Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/issue/78987"
},
{
"url": "https://go.dev/cl/771520"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4977"
}
],
"title": "Quadratic string concatenation in consumePhrase in net/mail"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-42499",
"datePublished": "2026-05-07T19:41:18.615Z",
"dateReserved": "2026-04-28T00:21:12.791Z",
"dateUpdated": "2026-05-08T21:29:59.662Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-42501 (GCVE-0-2026-42501)
Vulnerability from cvelistv5 – Published: 2026-05-07 19:41 – Updated: 2026-05-08 15:48
VLAI?
EPSS
Title
Malicious module proxy can bypass checksum database in cmd/go
Summary
A malicious module proxy can exploit a flaw in the go command's validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (GOSUMDB). A malicious module proxy can serve altered versions of the Go toolchain. When selecting a different version of the Go toolchain than the currently installed toolchain (due to the GOTOOLCHAIN environment variable, or a go.work or go.mod with a toolchain line), the go command will download and execute a toolchain provided by the module proxy. A malicious module proxy can bypass checksum database validation for this downloaded toolchain. Since this vulnerability affects the security of toolchain downloads, setting GOTOOLCHAIN to a fixed version is not sufficient. You must upgrade your base Go toolchain. The go tool always validates the hash of a toolchain before executing it, so fixed versions will refuse to execute any cached, altered versions of the toolchain. The go tool trusts go.sum files to contain accurate hashes of the current module's dependencies. A malicious proxy exploiting this vulnerability to serve an altered module will have caused an incorrect hash to be recorded in the go.sum. Users who have configured a non-trusted GOPROXY can determine if they have been affected by running "rm go.sum ; go mod tidy ; go mod verify", which will revalidate all dependencies of the current module. The specific flaw in more detail: The go command consults the checksum database to validate downloaded modules, when a module is not listed in the go.sum file. It verifies that the module hash reported by the checksum database matches the hash of the downloaded module. If, however, the checksum database returns a successful response that contains no entry for the module, the go command incorrectly permitted validation to succeed. A module proxy may mirror or proxy the checksum database, in which case the go command will not connect to the checksum database directly. Checksums reported by the checksum database are cryptographically signed, so a malicious proxy cannot alter the reported checksum for a module. However, a proxy which returns an empty checksum response, or a checksum response for an unrelated module, could cause the go command to proceed as if a downloaded module has been validated.
Severity ?
7.5 (High)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Go toolchain | cmd/go |
Affected:
0 , < 1.25.10
(semver)
Affected: 1.26.0-0 , < 1.26.3 (semver) |
Credits
Mundur (https://github.com/M0nd0R)
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2026-42501",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-08T15:48:05.053316Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347 Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T15:48:47.404Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected",
"packageName": "cmd/go",
"product": "cmd/go",
"vendor": "Go toolchain",
"versions": [
{
"lessThan": "1.25.10",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThan": "1.26.3",
"status": "affected",
"version": "1.26.0-0",
"versionType": "semver"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "Mundur (https://github.com/M0nd0R)"
}
],
"descriptions": [
{
"lang": "en",
"value": "A malicious module proxy can exploit a flaw in the go command\u0027s validation of module checksums to bypass checksum database validation. This vulnerability affects any user using an untrusted module proxy (GOMODPROXY) or checksum database (GOSUMDB). A malicious module proxy can serve altered versions of the Go toolchain. When selecting a different version of the Go toolchain than the currently installed toolchain (due to the GOTOOLCHAIN environment variable, or a go.work or go.mod with a toolchain line), the go command will download and execute a toolchain provided by the module proxy. A malicious module proxy can bypass checksum database validation for this downloaded toolchain. Since this vulnerability affects the security of toolchain downloads, setting GOTOOLCHAIN to a fixed version is not sufficient. You must upgrade your base Go toolchain. The go tool always validates the hash of a toolchain before executing it, so fixed versions will refuse to execute any cached, altered versions of the toolchain. The go tool trusts go.sum files to contain accurate hashes of the current module\u0027s dependencies. A malicious proxy exploiting this vulnerability to serve an altered module will have caused an incorrect hash to be recorded in the go.sum. Users who have configured a non-trusted GOPROXY can determine if they have been affected by running \"rm go.sum ; go mod tidy ; go mod verify\", which will revalidate all dependencies of the current module. The specific flaw in more detail: The go command consults the checksum database to validate downloaded modules, when a module is not listed in the go.sum file. It verifies that the module hash reported by the checksum database matches the hash of the downloaded module. If, however, the checksum database returns a successful response that contains no entry for the module, the go command incorrectly permitted validation to succeed. A module proxy may mirror or proxy the checksum database, in which case the go command will not connect to the checksum database directly. Checksums reported by the checksum database are cryptographically signed, so a malicious proxy cannot alter the reported checksum for a module. However, a proxy which returns an empty checksum response, or a checksum response for an unrelated module, could cause the go command to proceed as if a downloaded module has been validated."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-07T19:41:19.691Z",
"orgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"shortName": "Go"
},
"references": [
{
"url": "https://go.dev/cl/775321"
},
{
"url": "https://go.dev/issue/79070"
},
{
"url": "https://groups.google.com/g/golang-announce/c/qcCIEXso47M"
},
{
"url": "https://pkg.go.dev/vuln/GO-2026-4984"
}
],
"title": "Malicious module proxy can bypass checksum database in cmd/go"
}
},
"cveMetadata": {
"assignerOrgId": "1bb62c36-49e3-4200-9d77-64a1400537cc",
"assignerShortName": "Go",
"cveId": "CVE-2026-42501",
"datePublished": "2026-05-07T19:41:19.691Z",
"dateReserved": "2026-04-28T00:21:12.791Z",
"dateUpdated": "2026-05-08T15:48:47.404Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…