CVE-2026-22703: GO-2026-4309 - Cosign verification accepts any valid Rekor entry under certain conditions in github.com/sigstore/cosign

CVE-2026-22703 · Severity: low · CVSS 3.1 · Published 2026-01-13

Cosign verification accepts any valid Rekor entry under certain conditions 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-2026-22703 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-22703 being exploited in the wild.
How severe is CVE-2026-22703?
Low severity, with a CVSS score of 3.1, published 13 January 2026.
Which products and versions are affected?
github.com/sigstore/cosign (Go) SEMVER:introduced=0; github.com/sigstore/cosign/v2 (Go) SEMVER:introduced=0,fixed=2.6.2; github.com/sigstore/cosign/v3 (Go) SEMVER:introduced=0,fixed=3.0.4.
Is there a fix for CVE-2026-22703?
Yes. github.com/sigstore/cosign/v2 (Go): upgrade to 2.6.2 or later; github.com/sigstore/cosign/v3 (Go): upgrade to 3.0.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-22703?
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/v2 (Go): upgrade to 2.6.2 or later
    go get github.com/sigstore/cosign/v2@v2.6.2
  • github.com/sigstore/cosign/v3 (Go): upgrade to 3.0.4 or later
    go get github.com/sigstore/cosign/v3@v3.0.4

Affected products

  • github.com/sigstore/cosign (Go) SEMVER:introduced=0
  • github.com/sigstore/cosign/v2 (Go) SEMVER:introduced=0,fixed=2.6.2
  • github.com/sigstore/cosign/v3 (Go) SEMVER:introduced=0,fixed=3.0.4

Identifiers

  • CVE-2026-22703
  • GHSA-whqx-f9j3-ch6m
  • GO-2026-4309

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