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    6 vulnerabilities found for timestamp-authority by sigstore

    CVE-2026-49835 (GCVE-0-2026-49835)

    Vulnerability from nvd – Published: 2026-07-17 18:16 – Updated: 2026-07-17 19:45
    VLAI
    Title
    Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-17 19:45 UTC
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
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      ],
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    CVE-2026-39984 (GCVE-0-2026-39984)

    Vulnerability from nvd – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
    VLAI
    Title
    Sigstore Timestamp Authority has Improper Certificate Validation in verifier
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-04-16 14:00 UTC
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2025-66564 (GCVE-0-2025-66564)

    Vulnerability from nvd – Published: 2025-12-04 22:37 – Updated: 2025-12-05 14:55
    VLAI
    Title
    Sigstore Timestamp Authority allocates excessive memory during request parsing
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2025-12-05 14:55 UTC
    CWE
    • CWE-405 - Asymmetric Resource Consumption (Amplification)
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-49835 (GCVE-0-2026-49835)

    Vulnerability from cvelistv5 – Published: 2026-07-17 18:16 – Updated: 2026-07-17 19:45
    VLAI
    Title
    Sigstore Timestamp Authority: OOM due to unbounded metric label cardinality
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.1.0, the global wrapMetrics middleware records raw HTTP request path r.URL.Path and raw HTTP request method r.Method as Prometheus labels for latency and request count metric vectors before routing, allowing an unauthenticated remote attacker to issue requests with random paths such as /api/v1/timestamp/<uuid> or random HTTP methods and create unbounded permanent time-series entries that exhaust memory. This issue is fixed in version 2.1.0.
    Severity
    5.9 (Medium)
    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-07-17 19:45 UTC
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2026-39984 (GCVE-0-2026-39984)

    Vulnerability from cvelistv5 – Published: 2026-04-14 23:41 – Updated: 2026-04-16 14:00
    VLAI
    Title
    Sigstore Timestamp Authority has Improper Certificate Validation in verifier
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Versions 2.0.5 and below contain an authorization bypass vulnerability in the VerifyTimestampResponse function. VerifyTimestampResponse correctly verifies the certificate chain signature, but the TSA-specific constraint checks in VerifyLeafCert uses the first non-CA certificate from the PKCS#7 certificate bag instead of the leaf certificate from the verified chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key, causing the library to validate the signature against one certificate but perform authorization checks against another. This vulnerability only affects users of the timestamp-authority/v2/pkg/verification package and does not affect the timestamp-authority service itself or sigstore-go. The issue has been fixed in version 2.0.6.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-04-16 14:00 UTC
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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    CVE-2025-66564 (GCVE-0-2025-66564)

    Vulnerability from cvelistv5 – Published: 2025-12-04 22:37 – Updated: 2025-12-05 14:55
    VLAI
    Title
    Sigstore Timestamp Authority allocates excessive memory during request parsing
    Summary
    Sigstore Timestamp Authority is a service for issuing RFC 3161 timestamps. Prior to 2.0.3, Function api.ParseJSONRequest currently splits (via a call to strings.Split) an optionally-provided OID (which is untrusted data) on periods. Similarly, function api.getContentType splits the Content-Type header (which is also untrusted data) on an application string. As a result, in the face of a malicious request with either an excessively long OID in the payload containing many period characters or a malformed Content-Type header, a call to api.ParseJSONRequest or api.getContentType incurs allocations of O(n) bytes (where n stands for the length of the function's argument). This vulnerability is fixed in 2.0.3.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2025-12-05 14:55 UTC
    CWE
    • CWE-405 - Asymmetric Resource Consumption (Amplification)
    Assigner
    References
    Impacted products
    Show details on NVD website
    To clipboard 

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