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3 vulnerabilities found for timestamp-authority by sigstore

CVE-2026-49835 (GCVE-0-2026-49835)
Vulnerability from cvelistv5
Published
2026-07-17 18:16
Modified
2026-07-17 19:45
Severity ?
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-770 - Allocation of Resources Without Limits or Throttling
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.
References
Impacted products
Vendor Product Version
sigstore timestamp-authority Version: < 2.1.0
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CVE-2026-39984 (GCVE-0-2026-39984)
Vulnerability from cvelistv5
Published
2026-04-14 23:41
Modified
2026-04-16 14:00
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CWE
  • CWE-295 - Improper Certificate Validation
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.
References
Impacted products
Vendor Product Version
sigstore timestamp-authority Version: < 2.0.6
 Create a notification for this product.
Show details on NVD website

To clipboard 

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          "shortName": "CISA-ADP"
        },
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CVE-2025-66564 (GCVE-0-2025-66564)
Vulnerability from cvelistv5
Published
2025-12-04 22:37
Modified
2025-12-05 14:55
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-405 - Asymmetric Resource Consumption (Amplification)
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.
References
Impacted products
Vendor Product Version
sigstore timestamp-authority Version: < 2.0.3
 Create a notification for this product.
Show details on NVD website

To clipboard 

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