Search
Find a vulnerability
Search criteria
6 vulnerabilities found for sigstore-go by sigstore
CVE-2026-54787 (GCVE-0-2026-54787)
Vulnerability from nvd – Published: 2026-07-31 21:58 – Updated: 2026-07-31 23:36
VLAI
EPSS
VEX
Title
sigstore-go fails to check signature timestamps against a signing key's validity period
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 23:35 UTC
CWE
- CWE-324 - Use of a Key Past its Expiration Date
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/642 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/45… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.1
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-54787",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-31T23:35:40.966529Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T23:36:13.441Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 1.2.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-324",
"description": "CWE-324: Use of a Key Past its Expiration Date",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T21:58:14.156Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
},
{
"name": "https://github.com/sigstore/sigstore-go/pull/642",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/pull/642"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f"
},
{
"name": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1"
}
],
"source": {
"advisory": "GHSA-wqqc-jjcq-vfxm",
"discovery": "UNKNOWN"
},
"title": "sigstore-go fails to check signature timestamps against a signing key\u0027s validity period"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54787",
"datePublished": "2026-07-31T21:58:14.156Z",
"dateReserved": "2026-06-15T23:23:57.714Z",
"dateUpdated": "2026-07-31T23:36:13.441Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-49834 (GCVE-0-2026-49834)
Vulnerability from nvd – Published: 2026-07-17 19:20 – Updated: 2026-07-17 19:42
VLAI
EPSS
VEX
Title
sigstore-go: Multi-log threshold bypass via single compromised log
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:42 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/633 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/db… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.0
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-49834",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T19:42:04.325650Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T19:42:17.005Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 1.2.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N\u003e1) or WithSignedCertificateTimestamps(N\u003e1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T19:20:06.140Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"
},
{
"name": "https://github.com/sigstore/sigstore-go/pull/633",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/pull/633"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207"
},
{
"name": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0"
}
],
"source": {
"advisory": "GHSA-9vcr-p3rj-q5q6",
"discovery": "UNKNOWN"
},
"title": "sigstore-go: Multi-log threshold bypass via single compromised log"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-49834",
"datePublished": "2026-07-17T19:20:06.140Z",
"dateReserved": "2026-06-01T18:50:36.056Z",
"dateUpdated": "2026-07-17T19:42:17.005Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2024-45395 (GCVE-0-2024-45395)
Vulnerability from nvd – Published: 2024-09-04 20:15 – Updated: 2024-09-05 14:25
VLAI
EPSS
VEX
Title
Unbounded loop over untrusted input can lead to endless data attack
Summary
sigstore-go, a Go library for Sigstore signing and verification, is susceptible to a denial of service attack in versions prior to 0.6.1 when a verifier is provided a maliciously crafted Sigstore Bundle containing large amounts of verifiable data, in the form of signed transparency log entries, RFC 3161 timestamps, and attestation subjects. The verification of these data structures is computationally expensive. This can be used to consume excessive CPU resources, leading to a denial of service attack. TUF's security model labels this type of vulnerability an "Endless data attack," and can lead to verification failing to complete and disrupting services that rely on sigstore-go for verification. This vulnerability is addressed with sigstore-go 0.6.1, which adds hard limits to the number of verifiable data structures that can be processed in a bundle. Verification will fail if a bundle has data that exceeds these limits. The limits are 32 signed transparency log entries, 32 RFC 3161 timestamps, 1024 attestation subjects, and 32 digests per attestation subject. These limits are intended to be high enough to accommodate the vast majority of use cases, while preventing the verification of maliciously crafted bundles that contain large amounts of verifiable data. Users who are vulnerable but unable to quickly upgrade may consider adding manual bundle validation to enforce limits similar to those in the referenced patch prior to calling sigstore-go's verification functions.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-05 14:25 UTC
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/commit/01… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 0.6.1
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-45395",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-05T14:25:10.614381Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-05T14:25:27.922Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 0.6.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go, a Go library for Sigstore signing and verification, is susceptible to a denial of service attack in versions prior to 0.6.1 when a verifier is provided a maliciously crafted Sigstore Bundle containing large amounts of verifiable data, in the form of signed transparency log entries, RFC 3161 timestamps, and attestation subjects. The verification of these data structures is computationally expensive. This can be used to consume excessive CPU resources, leading to a denial of service attack. TUF\u0027s security model labels this type of vulnerability an \"Endless data attack,\" and can lead to verification failing to complete and disrupting services that rely on sigstore-go for verification. This vulnerability is addressed with sigstore-go 0.6.1, which adds hard limits to the number of verifiable data structures that can be processed in a bundle. Verification will fail if a bundle has data that exceeds these limits. The limits are 32 signed transparency log entries, 32 RFC 3161 timestamps, 1024 attestation subjects, and 32 digests per attestation subject. These limits are intended to be high enough to accommodate the vast majority of use cases, while preventing the verification of maliciously crafted bundles that contain large amounts of verifiable data. Users who are vulnerable but unable to quickly upgrade may consider adding manual bundle validation to enforce limits similar to those in the referenced patch prior to calling sigstore-go\u0027s verification functions."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-835",
"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-09-04T20:15:08.769Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-cq38-jh5f-37mq",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-cq38-jh5f-37mq"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/01e70e89e58226286d7977b4dba43b6be472b12c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/01e70e89e58226286d7977b4dba43b6be472b12c"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68"
}
],
"source": {
"advisory": "GHSA-cq38-jh5f-37mq",
"discovery": "UNKNOWN"
},
"title": "Unbounded loop over untrusted input can lead to endless data attack"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-45395",
"datePublished": "2024-09-04T20:15:08.769Z",
"dateReserved": "2024-08-28T20:21:32.802Z",
"dateUpdated": "2024-09-05T14:25:27.922Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
CVE-2026-54787 (GCVE-0-2026-54787)
Vulnerability from cvelistv5 – Published: 2026-07-31 21:58 – Updated: 2026-07-31 23:36
VLAI
EPSS
VEX
Title
sigstore-go fails to check signature timestamps against a signing key's validity period
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-31 23:35 UTC
CWE
- CWE-324 - Use of a Key Past its Expiration Date
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/642 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/45… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.1
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-54787",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-31T23:35:40.966529Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T23:36:13.441Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"references": [
{
"tags": [
"exploit"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 1.2.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.1, sigstore-go does not check a bundle signing timestamp against the validity window of an ExpiringKey wrapping a self-managed long-lived signing key without a certificate, which can allow an attacker holding expired key material to sign accepted bundles. This issue is fixed in version 1.2.1."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-324",
"description": "CWE-324: Use of a Key Past its Expiration Date",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-31T21:58:14.156Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-wqqc-jjcq-vfxm"
},
{
"name": "https://github.com/sigstore/sigstore-go/pull/642",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/pull/642"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/4594ab4c779d08be1f4419803a8249188f35ed5f"
},
{
"name": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.1"
}
],
"source": {
"advisory": "GHSA-wqqc-jjcq-vfxm",
"discovery": "UNKNOWN"
},
"title": "sigstore-go fails to check signature timestamps against a signing key\u0027s validity period"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-54787",
"datePublished": "2026-07-31T21:58:14.156Z",
"dateReserved": "2026-06-15T23:23:57.714Z",
"dateUpdated": "2026-07-31T23:36:13.441Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-49834 (GCVE-0-2026-49834)
Vulnerability from cvelistv5 – Published: 2026-07-17 19:20 – Updated: 2026-07-17 19:42
VLAI
EPSS
VEX
Title
sigstore-go: Multi-log threshold bypass via single compromised log
Summary
sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N>1) or WithSignedCertificateTimestamps(N>1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-17 19:42 UTC
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/pull/633 | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/commit/db… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/releases/… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 1.2.0
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-49834",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T19:42:04.325650Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T19:42:17.005Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 1.2.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go is a Go library for Sigstore signing and verification. Prior to 1.2.0, a verifier configured with WithTransparencyLog(N\u003e1) or WithSignedCertificateTimestamps(N\u003e1) counts verified witnesses per entry or per validation path rather than per log authority, allowing a single compromised transparency log or CT log to satisfy multi-log threshold requirements and defeat the multi-log policy. This issue is fixed in version 1.2.0."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-07-17T19:20:06.140Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-9vcr-p3rj-q5q6"
},
{
"name": "https://github.com/sigstore/sigstore-go/pull/633",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/pull/633"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/dbb07e62623edd5b175fb9dd5a41dcb85a159207"
},
{
"name": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/releases/tag/v1.2.0"
}
],
"source": {
"advisory": "GHSA-9vcr-p3rj-q5q6",
"discovery": "UNKNOWN"
},
"title": "sigstore-go: Multi-log threshold bypass via single compromised log"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-49834",
"datePublished": "2026-07-17T19:20:06.140Z",
"dateReserved": "2026-06-01T18:50:36.056Z",
"dateUpdated": "2026-07-17T19:42:17.005Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2024-45395 (GCVE-0-2024-45395)
Vulnerability from cvelistv5 – Published: 2024-09-04 20:15 – Updated: 2024-09-05 14:25
VLAI
EPSS
VEX
Title
Unbounded loop over untrusted input can lead to endless data attack
Summary
sigstore-go, a Go library for Sigstore signing and verification, is susceptible to a denial of service attack in versions prior to 0.6.1 when a verifier is provided a maliciously crafted Sigstore Bundle containing large amounts of verifiable data, in the form of signed transparency log entries, RFC 3161 timestamps, and attestation subjects. The verification of these data structures is computationally expensive. This can be used to consume excessive CPU resources, leading to a denial of service attack. TUF's security model labels this type of vulnerability an "Endless data attack," and can lead to verification failing to complete and disrupting services that rely on sigstore-go for verification. This vulnerability is addressed with sigstore-go 0.6.1, which adds hard limits to the number of verifiable data structures that can be processed in a bundle. Verification will fail if a bundle has data that exceeds these limits. The limits are 32 signed transparency log entries, 32 RFC 3161 timestamps, 1024 attestation subjects, and 32 digests per attestation subject. These limits are intended to be high enough to accommodate the vast majority of use cases, while preventing the verification of maliciously crafted bundles that contain large amounts of verifiable data. Users who are vulnerable but unable to quickly upgrade may consider adding manual bundle validation to enforce limits similar to those in the referenced patch prior to calling sigstore-go's verification functions.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-05 14:25 UTC
CWE
- CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/sigstore/sigstore-go/security/… | x_refsource_CONFIRM |
| https://github.com/sigstore/sigstore-go/commit/01… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
| https://github.com/sigstore/sigstore-go/blob/725e… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| sigstore | sigstore-go |
Affected:
< 0.6.1
|
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-45395",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-05T14:25:10.614381Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-09-05T14:25:27.922Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "sigstore-go",
"vendor": "sigstore",
"versions": [
{
"status": "affected",
"version": "\u003c 0.6.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "sigstore-go, a Go library for Sigstore signing and verification, is susceptible to a denial of service attack in versions prior to 0.6.1 when a verifier is provided a maliciously crafted Sigstore Bundle containing large amounts of verifiable data, in the form of signed transparency log entries, RFC 3161 timestamps, and attestation subjects. The verification of these data structures is computationally expensive. This can be used to consume excessive CPU resources, leading to a denial of service attack. TUF\u0027s security model labels this type of vulnerability an \"Endless data attack,\" and can lead to verification failing to complete and disrupting services that rely on sigstore-go for verification. This vulnerability is addressed with sigstore-go 0.6.1, which adds hard limits to the number of verifiable data structures that can be processed in a bundle. Verification will fail if a bundle has data that exceeds these limits. The limits are 32 signed transparency log entries, 32 RFC 3161 timestamps, 1024 attestation subjects, and 32 digests per attestation subject. These limits are intended to be high enough to accommodate the vast majority of use cases, while preventing the verification of maliciously crafted bundles that contain large amounts of verifiable data. Users who are vulnerable but unable to quickly upgrade may consider adding manual bundle validation to enforce limits similar to those in the referenced patch prior to calling sigstore-go\u0027s verification functions."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 3.1,
"baseSeverity": "LOW",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-835",
"description": "CWE-835: Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2024-09-04T20:15:08.769Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-cq38-jh5f-37mq",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/sigstore/sigstore-go/security/advisories/GHSA-cq38-jh5f-37mq"
},
{
"name": "https://github.com/sigstore/sigstore-go/commit/01e70e89e58226286d7977b4dba43b6be472b12c",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/commit/01e70e89e58226286d7977b4dba43b6be472b12c"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/signature.go#L183-L193"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tlog.go#L74-L178"
},
{
"name": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/sigstore/sigstore-go/blob/725e508ed4933e6f5b5206e32af4bbe76f587b54/pkg/verify/tsa.go#L59-L68"
}
],
"source": {
"advisory": "GHSA-cq38-jh5f-37mq",
"discovery": "UNKNOWN"
},
"title": "Unbounded loop over untrusted input can lead to endless data attack"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2024-45395",
"datePublished": "2024-09-04T20:15:08.769Z",
"dateReserved": "2024-08-28T20:21:32.802Z",
"dateUpdated": "2024-09-05T14:25:27.922Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}