CVE-2026-24122: Cosign considered signatures valid with expired intermediate certificates when transparency log verification is skipped

CVE-2026-24122 · Severity: low · CVSS 3.1 · Published 2026-02-23

Cosign considered signatures valid with expired intermediate certificates when transparency log verification is skipped in github.com/sigstore/cosign

Technologies: github.com/sigstore/cosign (Go), github.com/sigstore/cosign/v2 (Go), github.com/sigstore/cosign/v3 (Go). Vendors: Go.

Quick answers

Is CVE-2026-24122 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-24122 being exploited in the wild.
How severe is CVE-2026-24122?
Low severity, with a CVSS score of 3.1, published 23 February 2026.
Which products and versions are affected?
github.com/sigstore/cosign (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=3.0.5; github.com/sigstore/cosign/v2 (Go) SEMVER:introduced=0; github.com/sigstore/cosign/v3 (Go) SEMVER:introduced=0,fixed=3.0.5.
Is there a fix for CVE-2026-24122?
Yes. github.com/sigstore/cosign (Go): upgrade to 3.0.5 or later; github.com/sigstore/cosign/v3 (Go): upgrade to 3.0.5 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-24122?
Check whether you run github.com/sigstore/cosign (Go), github.com/sigstore/cosign/v2 (Go) or github.com/sigstore/cosign/v3 (Go) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/sigstore/cosign (Go): upgrade to 3.0.5 or later
    go get github.com/sigstore/cosign@v3.0.5
  • github.com/sigstore/cosign/v3 (Go): upgrade to 3.0.5 or later
    go get github.com/sigstore/cosign/v3@v3.0.5

Affected products

  • github.com/sigstore/cosign (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=3.0.5
  • github.com/sigstore/cosign/v2 (Go) SEMVER:introduced=0
  • github.com/sigstore/cosign/v3 (Go) SEMVER:introduced=0,fixed=3.0.5

Identifiers

  • CVE-2026-24122
  • GHSA-wfqv-66vq-46rm
  • GO-2026-4529

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