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Vulnerability from cleanstart
Published
2026-04-01 09:25
Modified
2026-03-24 12:47
Summary
Security fixes for CVE-2026-1229, CVE-2026-24051, CVE-2026-25679, CVE-2026-26958, CVE-2026-27139, CVE-2026-27141, CVE-2026-27142, ghsa-9h8m-3fm2-qjrq, ghsa-fw7p-63qq-7hpr, ghsa-p77j-4mvh-x3m3, ghsa-q9hv-hpm4-hj6x applied in versions: 3.7.8-r2, 3.7.8-r3
Details
Multiple security vulnerabilities affect the argo-workflows-fips package. These issues are resolved in later releases. See references for individual vulnerability details.
References
{
"affected": [
{
"package": {
"ecosystem": "CleanStart",
"name": "argo-workflows-fips"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.7.8-r3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"credits": [],
"database_specific": {},
"details": "Multiple security vulnerabilities affect the argo-workflows-fips package. These issues are resolved in later releases. See references for individual vulnerability details.",
"id": "CLEANSTART-2026-PZ85180",
"modified": "2026-03-24T12:47:42Z",
"published": "2026-04-01T09:25:09.013456Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-PZ85180.json"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-1229"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-24051"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-25679"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-26958"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-27139"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-27141"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/CVE-2026-27142"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-9h8m-3fm2-qjrq"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-fw7p-63qq-7hpr"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-p77j-4mvh-x3m3"
},
{
"type": "WEB",
"url": "https://osv.dev/vulnerability/ghsa-q9hv-hpm4-hj6x"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1229"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-24051"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25679"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26958"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27139"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27141"
},
{
"type": "WEB",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27142"
}
],
"related": [],
"schema_version": "1.7.3",
"summary": "Security fixes for CVE-2026-1229, CVE-2026-24051, CVE-2026-25679, CVE-2026-26958, CVE-2026-27139, CVE-2026-27141, CVE-2026-27142, ghsa-9h8m-3fm2-qjrq, ghsa-fw7p-63qq-7hpr, ghsa-p77j-4mvh-x3m3, ghsa-q9hv-hpm4-hj6x applied in versions: 3.7.8-r2, 3.7.8-r3",
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"CVE-2026-24051",
"CVE-2026-25679",
"CVE-2026-26958",
"CVE-2026-27139",
"CVE-2026-27141",
"CVE-2026-27142",
"ghsa-9h8m-3fm2-qjrq",
"ghsa-fw7p-63qq-7hpr",
"ghsa-p77j-4mvh-x3m3",
"ghsa-q9hv-hpm4-hj6x"
]
}
CVE-2026-1229 (GCVE-0-2026-1229)
Vulnerability from cvelistv5 – Published: 2026-02-24 07:58 – Updated: 2026-02-24 15:10
VLAI?
EPSS
Title
Incorrect calculation in CIRCL secp384r1 CombinedMult
Summary
The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas.
ECDH and ECDSA signing relying on this curve are not affected.
The bug was fixed in v1.6.3 https://github.com/cloudflare/circl/releases/tag/v1.6.3 .
Severity ?
CWE
- CWE-682 - Incorrect Calculation
Assigner
References
| URL | Tags | |
|---|---|---|
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Cloudflare | CIRCL |
Affected:
CIRCL up to version 1.6.2 , < 1.6.3
(custom)
|
Credits
Guido Vranken
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CVE-2026-27142 (GCVE-0-2026-27142)
Vulnerability from cvelistv5 – Published: 2026-03-06 21:28 – Updated: 2026-03-16 15:21
VLAI?
EPSS
Title
URLs in meta content attribute actions are not escaped in html/template
Summary
Actions which insert URLs into the content attribute of HTML meta tags are not escaped. This can allow XSS if the meta tag also has an http-equiv attribute with the value "refresh". A new GODEBUG setting has been added, htmlmetacontenturlescape, which can be used to disable escaping URLs in actions in the meta content attribute which follow "url=" by setting htmlmetacontenturlescape=0.
Severity ?
6.1 (Medium)
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | html/template |
Affected:
0 , < 1.25.8
(semver)
Affected: 1.26.0-0 , < 1.26.1 (semver) |
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"url": "https://go.dev/cl/752081"
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CVE-2026-27139 (GCVE-0-2026-27139)
Vulnerability from cvelistv5 – Published: 2026-03-06 21:28 – Updated: 2026-03-09 14:53
VLAI?
EPSS
Title
FileInfo can escape from a Root in os
Summary
On Unix platforms, when listing the contents of a directory using File.ReadDir or File.Readdir the returned FileInfo could reference a file outside of the Root in which the File was opened. The impact of this escape is limited to reading metadata provided by lstat from arbitrary locations on the filesystem without permitting reading or writing files outside the root.
Severity ?
CWE
- CWE-363 - Race Condition Enabling Link Following
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | os |
Affected:
0 , < 1.25.8
(semver)
Affected: 1.26.0-0 , < 1.26.1 (semver) |
Credits
Miloslav Trmač of Red Hat
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CVE-2026-27141 (GCVE-0-2026-27141)
Vulnerability from cvelistv5 – Published: 2026-02-26 18:50 – Updated: 2026-02-27 19:11
VLAI?
EPSS
Title
Sending certain HTTP/2 frames can cause a server to panic in golang.org/x/net
Summary
Due to missing nil check, sending 0x0a-0x0f HTTP/2 frames will cause a running server to panic
Severity ?
7.5 (High)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| golang.org/x/net | golang.org/x/net/http2 |
Affected:
0.50.0 , < 0.51.0
(semver)
|
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{
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{
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},
{
"name": "Framer.ReadFrameForHeader"
},
{
"name": "Framer.ReadFrameHeader"
},
{
"name": "Framer.WriteContinuation"
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{
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},
{
"name": "Framer.WriteDataPadded"
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{
"name": "Framer.WriteGoAway"
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{
"name": "Framer.WriteHeaders"
},
{
"name": "Framer.WritePing"
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{
"name": "Framer.WritePriority"
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{
"name": "Framer.WritePriorityUpdate"
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{
"name": "Framer.WritePushPromise"
},
{
"name": "Framer.WriteRSTStream"
},
{
"name": "Framer.WriteRawFrame"
},
{
"name": "Framer.WriteSettings"
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{
"name": "Framer.WriteSettingsAck"
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"name": "Framer.WriteWindowUpdate"
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{
"name": "GoAwayError.Error"
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"name": "ReadFrameHeader"
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{
"name": "Server.ServeConn"
},
{
"name": "Setting.String"
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{
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{
"name": "SettingsFrame.ForeachSetting"
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{
"name": "Transport.CloseIdleConnections"
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{
"name": "Transport.NewClientConn"
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{
"name": "bufferedWriterTimeoutWriter.Write"
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{
"name": "chunkWriter.Write"
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"name": "clientConnPool.GetClientConn"
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"name": "connError.Error"
},
{
"name": "dataBuffer.Read"
},
{
"name": "duplicatePseudoHeaderError.Error"
},
{
"name": "gzipReader.Close"
},
{
"name": "gzipReader.Read"
},
{
"name": "headerFieldNameError.Error"
},
{
"name": "headerFieldValueError.Error"
},
{
"name": "netHTTPClientConn.Close"
},
{
"name": "netHTTPClientConn.RoundTrip"
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"name": "noDialClientConnPool.GetClientConn"
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{
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"name": "priorityWriteSchedulerRFC9218.OpenStream"
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"name": "pseudoHeaderError.Error"
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"name": "requestBody.Close"
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"name": "responseWriter.Flush"
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"name": "responseWriter.WriteHeader"
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CVE-2026-26958 (GCVE-0-2026-26958)
Vulnerability from cvelistv5 – Published: 2026-02-19 23:01 – Updated: 2026-02-20 15:39
VLAI?
EPSS
Title
filippo.io/edwards25519 MultiScalarMult function produces invalid results or undefined behavior if receiver is not the identity
Summary
filippo.io/edwards25519 is a Go library implementing the edwards25519 elliptic curve with APIs for building cryptographic primitives. In versions 1.1.0 and earlier, MultiScalarMult produces invalid results or undefined behavior if the receiver is not the identity point. If (*Point).MultiScalarMult is called on an initialized point that is not the identity point, it returns an incorrect result. If the method is called on an uninitialized point, the behavior is undefined. In particular, if the receiver is the zero value, MultiScalarMult returns an invalid point that compares Equal to every other point. Note that MultiScalarMult is a rarely used, advanced API. For example, users who depend on filippo.io/edwards25519 only through github.com/go-sql-driver/mysql are not affected. This issue has been fixed in version 1.1.1.
Severity ?
CWE
- CWE-665 - Improper Initialization
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| FiloSottile | filippo.io/edwards25519 |
Affected:
< 1.1.1
|
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CVE-2026-25679 (GCVE-0-2026-25679)
Vulnerability from cvelistv5 – Published: 2026-03-06 21:28 – Updated: 2026-03-10 13:37
VLAI?
EPSS
Title
Incorrect parsing of IPv6 host literals in net/url
Summary
url.Parse insufficiently validated the host/authority component and accepted some invalid URLs.
Severity ?
7.5 (High)
CWE
- CWE-1286 - Improper Validation of Syntactic Correctness of Input
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Go standard library | net/url |
Affected:
0 , < 1.25.8
(semver)
Affected: 1.26.0-0 , < 1.26.1 (semver) |
Credits
Masaki Hara (https://github.com/qnighy) of Wantedly
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CVE-2026-24051 (GCVE-0-2026-24051)
Vulnerability from cvelistv5 – Published: 2026-02-02 19:49 – Updated: 2026-02-03 14:54
VLAI?
EPSS
Title
OpenTelemetry-Go Affected by Arbitrary Code Execution via PATH Hijacking
Summary
OpenTelemetry-Go is the Go implementation of OpenTelemetry. The OpenTelemetry Go SDK in version v1.20.0-1.39.0 is vulnerable to Path Hijacking (Untrusted Search Paths) on macOS/Darwin systems. The resource detection code in sdk/resource/host_id.go executes the ioreg system command using a search path. An attacker with the ability to locally modify the PATH environment variable can achieve Arbitrary Code Execution (ACE) within the context of the application. A fix was released with v1.40.0.
Severity ?
CWE
- CWE-426 - Untrusted Search Path
Assigner
References
| URL | Tags | |||||||
|---|---|---|---|---|---|---|---|---|
|
||||||||
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| open-telemetry | opentelemetry-go |
Affected:
>= 1.21.0, < 1.40.0
|
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GHSA-9H8M-3FM2-QJRQ
Vulnerability from github – Published: 2026-02-02 20:07 – Updated: 2026-02-27 21:39
VLAI?
Summary
OpenTelemetry Go SDK Vulnerable to Arbitrary Code Execution via PATH Hijacking
Details
Impact
The OpenTelemetry Go SDK in version v1.20.0-1.39.0 is vulnerable to Path Hijacking (Untrusted Search Paths) on macOS/Darwin systems. The resource detection code in sdk/resource/host_id.go executes the ioreg system command using a search path. An attacker with the ability to locally modify the PATH environment variable can achieve Arbitrary Code Execution (ACE) within the context of the application.
Patches
This has been patched in d45961b, which was released with v1.40.0.
References
Severity ?
7.0 (High)
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"id": "GHSA-9h8m-3fm2-qjrq",
"modified": "2026-02-27T21:39:46Z",
"published": "2026-02-02T20:07:46Z",
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{
"type": "WEB",
"url": "https://github.com/open-telemetry/opentelemetry-go/commit/d45961bcda453fcbdb6469c22d6e88a1f9970a53"
},
{
"type": "PACKAGE",
"url": "https://github.com/open-telemetry/opentelemetry-go"
},
{
"type": "WEB",
"url": "https://pkg.go.dev/vuln/GO-2026-4394"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "OpenTelemetry Go SDK Vulnerable to Arbitrary Code Execution via PATH Hijacking"
}
GHSA-Q9HV-HPM4-HJ6X
Vulnerability from github – Published: 2026-02-25 19:17 – Updated: 2026-02-25 19:17
VLAI?
Summary
CIRCL has an incorrect calculation in secp384r1 CombinedMult
Details
The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas. ECDH and ECDSA signing relying on this curve are not affected.
The bug was fixed in v1.6.3.
Severity ?
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "github.com/cloudflare/circl"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.6.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-1229"
],
"database_specific": {
"cwe_ids": [
"CWE-682"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-25T19:17:50Z",
"nvd_published_at": "2026-02-24T08:16:28Z",
"severity": "LOW"
},
"details": "The CombinedMult function in the CIRCL ecc/p384 package (secp384r1 curve) produces an incorrect value for specific inputs. The issue is fixed by using complete addition formulas.\nECDH and ECDSA signing relying on this curve are not affected.\n\nThe bug was fixed in **[v1.6.3](https://github.com/cloudflare/circl/releases/tag/v1.6.3)**.",
"id": "GHSA-q9hv-hpm4-hj6x",
"modified": "2026-02-25T19:17:50Z",
"published": "2026-02-25T19:17:50Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/cloudflare/circl/security/advisories/GHSA-q9hv-hpm4-hj6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-1229"
},
{
"type": "WEB",
"url": "https://github.com/cloudflare/circl/pull/583"
},
{
"type": "PACKAGE",
"url": "https://github.com/cloudflare/circl"
},
{
"type": "WEB",
"url": "https://github.com/cloudflare/circl/releases/tag/v1.6.3"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P/S:N/AU:Y/U:Amber",
"type": "CVSS_V4"
}
],
"summary": "CIRCL has an incorrect calculation in secp384r1 CombinedMult"
}
GHSA-FW7P-63QQ-7HPR
Vulnerability from github – Published: 2026-02-18 22:37 – Updated: 2026-02-20 16:46
VLAI?
Summary
filippo.io/edwards25519 MultiScalarMult produces invalid results or undefined behavior if receiver is not the identity
Details
(*Point).MultiScalarMult failed to initialize its receiver.
If the method was called on an initialized point that is not the identity point, MultiScalarMult produced an incorrect result.
If the method was called on an uninitialized point, the behavior was undefined. In particular, if the receiver was the zero value, MultiScalarMult returned an invalid point that compared Equal to every point.
Note that MultiScalarMult is a rarely used advanced API. For example, if you only depend on filippo.io/edwards25519 via github.com/go-sql-driver/mysql, you are not affected. If you were notified of this issue despite not being affected, consider switching to a vulnerability scanner that is more precise and respectful of your attention, like govulncheck.
Severity ?
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "filippo.io/edwards25519"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.1.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-26958"
],
"database_specific": {
"cwe_ids": [
"CWE-665"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-18T22:37:15Z",
"nvd_published_at": "2026-02-19T23:16:26Z",
"severity": "LOW"
},
"details": "`(*Point).MultiScalarMult` failed to initialize its receiver.\n\nIf the method was called on an initialized point that is not the identity point, MultiScalarMult produced an incorrect result.\n\nIf the method was called on an uninitialized point, the behavior was undefined. In particular, if the receiver was the zero value, MultiScalarMult returned an invalid point that compared Equal to every point.\n\n*Note that MultiScalarMult is a rarely used advanced API. For example, if you only depend on `filippo.io/edwards25519` via `github.com/go-sql-driver/mysql`, **you are not affected**. If you were notified of this issue despite not being affected, consider switching to a vulnerability scanner that is more precise and respectful of your attention, like [govulncheck](https://go.dev/doc/tutorial/govulncheck).*",
"id": "GHSA-fw7p-63qq-7hpr",
"modified": "2026-02-20T16:46:42Z",
"published": "2026-02-18T22:37:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/FiloSottile/edwards25519/security/advisories/GHSA-fw7p-63qq-7hpr"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26958"
},
{
"type": "WEB",
"url": "https://github.com/FiloSottile/edwards25519/commit/d1c650afb95fad0742b98d95f2eb2cf031393abb"
},
{
"type": "PACKAGE",
"url": "https://github.com/FiloSottile/edwards25519"
},
{
"type": "WEB",
"url": "https://github.com/FiloSottile/edwards25519/releases/tag/v1.1.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U",
"type": "CVSS_V4"
}
],
"summary": "filippo.io/edwards25519 MultiScalarMult produces invalid results or undefined behavior if receiver is not the identity"
}
GHSA-P77J-4MVH-X3M3
Vulnerability from github – Published: 2026-03-18 20:10 – Updated: 2026-03-25 18:12
VLAI?
Summary
gRPC-Go has an authorization bypass via missing leading slash in :path
Details
Impact
What kind of vulnerability is it? Who is impacted?
It is an Authorization Bypass resulting from Improper Input Validation of the HTTP/2 :path pseudo-header.
The gRPC-Go server was too lenient in its routing logic, accepting requests where the :path omitted the mandatory leading slash (e.g., Service/Method instead of /Service/Method). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official grpc/authz package) evaluated the raw, non-canonical path string. Consequently, "deny" rules defined using canonical paths (starting with /) failed to match the incoming request, allowing it to bypass the policy if a fallback "allow" rule was present.
Who is impacted?
This affects gRPC-Go servers that meet both of the following criteria:
1. They use path-based authorization interceptors, such as the official RBAC implementation in google.golang.org/grpc/authz or custom interceptors relying on info.FullMethod or grpc.Method(ctx).
2. Their security policy contains specific "deny" rules for canonical paths but allows other requests by default (a fallback "allow" rule).
The vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed :path headers directly to the gRPC server.
Patches
Has the problem been patched? What versions should users upgrade to?
Yes, the issue has been patched. The fix ensures that any request with a :path that does not start with a leading slash is immediately rejected with a codes.Unimplemented error, preventing it from reaching authorization interceptors or handlers with a non-canonical path string.
Users should upgrade to the following versions (or newer): * v1.79.3 * The latest master branch.
It is recommended that all users employing path-based authorization (especially grpc/authz) upgrade as soon as the patch is available in a tagged release.
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
While upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods:
1. Use a Validating Interceptor (Recommended Mitigation)
Add an "outermost" interceptor to your server that validates the path before any other authorization logic runs:
func pathValidationInterceptor(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
if info.FullMethod == "" || info.FullMethod[0] != '/' {
return nil, status.Errorf(codes.Unimplemented, "malformed method name")
}
return handler(ctx, req)
}
// Ensure this is the FIRST interceptor in your chain
s := grpc.NewServer(
grpc.ChainUnaryInterceptor(pathValidationInterceptor, authzInterceptor),
)
2. Infrastructure-Level Normalization
If your gRPC server is behind a reverse proxy or load balancer (such as Envoy, NGINX, or an L7 Cloud Load Balancer), ensure it is configured to enforce strict HTTP/2 compliance for pseudo-headers and reject or normalize requests where the :path header does not start with a leading slash.
3. Policy Hardening
Switch to a "default deny" posture in your authorization policies (explicitly listing all allowed paths and denying everything else) to reduce the risk of bypasses via malformed inputs.
Severity ?
9.1 (Critical)
{
"affected": [
{
"package": {
"ecosystem": "Go",
"name": "google.golang.org/grpc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.79.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-33186"
],
"database_specific": {
"cwe_ids": [
"CWE-285"
],
"github_reviewed": true,
"github_reviewed_at": "2026-03-18T20:10:29Z",
"nvd_published_at": "2026-03-20T23:16:45Z",
"severity": "CRITICAL"
},
"details": "### Impact\n_What kind of vulnerability is it? Who is impacted?_\n\nIt is an **Authorization Bypass** resulting from **Improper Input Validation** of the HTTP/2 `:path` pseudo-header.\n\nThe gRPC-Go server was too lenient in its routing logic, accepting requests where the `:path` omitted the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server successfully routed these requests to the correct handler, authorization interceptors (including the official `grpc/authz` package) evaluated the raw, non-canonical path string. Consequently, \"deny\" rules defined using canonical paths (starting with `/`) failed to match the incoming request, allowing it to bypass the policy if a fallback \"allow\" rule was present.\n\n**Who is impacted?**\nThis affects gRPC-Go servers that meet both of the following criteria:\n1. They use path-based authorization interceptors, such as the official RBAC implementation in `google.golang.org/grpc/authz` or custom interceptors relying on `info.FullMethod` or `grpc.Method(ctx)`.\n2. Their security policy contains specific \"deny\" rules for canonical paths but allows other requests by default (a fallback \"allow\" rule).\n\nThe vulnerability is exploitable by an attacker who can send raw HTTP/2 frames with malformed `:path` headers directly to the gRPC server.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nYes, the issue has been patched. The fix ensures that any request with a `:path` that does not start with a leading slash is immediately rejected with a `codes.Unimplemented` error, preventing it from reaching authorization interceptors or handlers with a non-canonical path string.\n\nUsers should upgrade to the following versions (or newer):\n* **v1.79.3**\n* The latest **master** branch.\n\nIt is recommended that all users employing path-based authorization (especially `grpc/authz`) upgrade as soon as the patch is available in a tagged release.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nWhile upgrading is the most secure and recommended path, users can mitigate the vulnerability using one of the following methods:\n\n#### 1. Use a Validating Interceptor (Recommended Mitigation)\nAdd an \"outermost\" interceptor to your server that validates the path before any other authorization logic runs:\n\n```go\nfunc pathValidationInterceptor(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {\n if info.FullMethod == \"\" || info.FullMethod[0] != \u0027/\u0027 {\n return nil, status.Errorf(codes.Unimplemented, \"malformed method name\")\n } \n return handler(ctx, req)\n}\n\n// Ensure this is the FIRST interceptor in your chain\ns := grpc.NewServer(\n grpc.ChainUnaryInterceptor(pathValidationInterceptor, authzInterceptor),\n)\n```\n\n#### 2. Infrastructure-Level Normalization\nIf your gRPC server is behind a reverse proxy or load balancer (such as Envoy, NGINX, or an L7 Cloud Load Balancer), ensure it is configured to enforce strict HTTP/2 compliance for pseudo-headers and reject or normalize requests where the `:path` header does not start with a leading slash.\n\n#### 3. Policy Hardening\nSwitch to a \"default deny\" posture in your authorization policies (explicitly listing all allowed paths and denying everything else) to reduce the risk of bypasses via malformed inputs.",
"id": "GHSA-p77j-4mvh-x3m3",
"modified": "2026-03-25T18:12:09Z",
"published": "2026-03-18T20:10:29Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/grpc/grpc-go/security/advisories/GHSA-p77j-4mvh-x3m3"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33186"
},
{
"type": "PACKAGE",
"url": "https://github.com/grpc/grpc-go"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
"type": "CVSS_V3"
}
],
"summary": "gRPC-Go has an authorization bypass via missing leading slash in :path"
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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