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This PR contains the following updates:
v2.0.5→v2.0.6Warning
Some dependencies could not be looked up. Check the Dependency Dashboard for more information.
GitHub Vulnerability Alerts
CVE-2026-39984
Authorization bypass via certificate bag manipulation in sigstore/timestamp-authority verifier
An authorization bypass vulnerability exists in sigstore/timestamp-authority verifier (timestamp-authority/v2/pkg/verification):
VerifyTimestampResponsefunction correctly verifies the certificate chain but when the TSA specific constraints are verified inVerifyLeafCert, the first non-CA certificate from the PKCS#7 certificate bag is used instead of the leaf certificate from the certificate chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key. The library validates the signature using the one certificate but performs authorization checks on the another, allowing an attacker to bypass some authorization controls.This vulnerability does not apply to timestamp-authority service, only to users of
timestamp-authority/v2/pkg/verificationpackage.This vulnerability does not apply to sigstore-go even though it is a user of
timestamp-authority/v2/pkg/verification: ProvidingTSACertificateoption toVerifyTimestampResponsefully mitigates the issue.Patches
The issue will be fixed in timestamp-authority 2.0.6
Workarounds
Users of
VerifyTimestampResponsecan use theTSACertificateoption to specify the exact certificate they expect to be used: this fully mitigates the issue.References
This issue was found after reading CVE-2026-33753 / GHSA-3xxc-pwj6-jgrj (originally reported by @Jaynornj and @Pr00fOf3xpl0it)
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NSigstore Timestamp Authority has Improper Certificate Validation in verifier
CVE-2026-39984 / GHSA-xm5m-wgh2-rrg3
More information
Details
Authorization bypass via certificate bag manipulation in sigstore/timestamp-authority verifier
An authorization bypass vulnerability exists in sigstore/timestamp-authority verifier (timestamp-authority/v2/pkg/verification):
VerifyTimestampResponsefunction correctly verifies the certificate chain but when the TSA specific constraints are verified inVerifyLeafCert, the first non-CA certificate from the PKCS#7 certificate bag is used instead of the leaf certificate from the certificate chain. An attacker can exploit this by prepending a forged certificate to the certificate bag while the message is signed with an authorized key. The library validates the signature using the one certificate but performs authorization checks on the another, allowing an attacker to bypass some authorization controls.This vulnerability does not apply to timestamp-authority service, only to users of
timestamp-authority/v2/pkg/verificationpackage.This vulnerability does not apply to sigstore-go even though it is a user of
timestamp-authority/v2/pkg/verification: ProvidingTSACertificateoption toVerifyTimestampResponsefully mitigates the issue.Patches
The issue will be fixed in timestamp-authority 2.0.6
Workarounds
Users of
VerifyTimestampResponsecan use theTSACertificateoption to specify the exact certificate they expect to be used: this fully mitigates the issue.References
This issue was found after reading CVE-2026-33753 / GHSA-3xxc-pwj6-jgrj (originally reported by @Jaynornj and @Pr00fOf3xpl0it)
Severity
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:NReferences
This data is provided by OSV and the GitHub Advisory Database (CC-BY 4.0).
Release Notes
sigstore/timestamp-authority (github.com/sigstore/timestamp-authority/v2)
v2.0.6Compare Source
What's Changed
Full Changelog: sigstore/timestamp-authority@v2.0.5...v2.0.6
Configuration
📅 Schedule: (UTC)
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
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This PR has been generated by Renovate Bot.