Improper Certificate Validation Affecting docker package, versions <29.4.0_ce-150000.253.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.1% (2nd percentile)

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  • Snyk IDSNYK-SLES156-DOCKER-17747352
  • published1 Jul 2026
  • disclosed30 Jun 2026

Introduced: 30 Jun 2026

NewCVE-2026-39984  (opens in a new tab)
CWE-295  (opens in a new tab)

How to fix?

Upgrade SLES:15.6 docker to version 29.4.0_ce-150000.253.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream docker package and not the docker package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1