critical · 9.3 Patched

pypi-publish action revocation of CA in the chain that Sigstore uses in Trusted Publishing and Digital Attestations for PyPI

GHSA-5xjx-3w67-w9x9 · published 30 Oct 2026

How serious is it

  • Severity: critical, CVSS score 9.3 out of 10.
  • No exploit prediction (EPSS) score yet.
  • Not on the CISA list of exploited vulnerabilities.
  • No public exploit in Exploit-DB.

Is your app affected by GHSA-5xjx-3w67-w9x9?

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Who is affected

  • pypa/gh-action-pypi-publish (GitHub Actions) <= 1.14.2

How to check

  1. Look for pypa/gh-action-pypi-publish in your lockfile and compare its version with the range above.
  2. Or paste your lockfile into the checker: it lists every package with a known vulnerability, this one included.

How to fix

Copies a prompt for Claude Code, Cursor or Codex: it checks your lockfiles for this and upgrades it.
  1. Upgrade pypa/gh-action-pypi-publish to 1.14.3 or later, commit the lockfile and redeploy.
  2. If a vulnerable version was live, check your logs and rotate the secrets that server could read.

The advisory

### Summary The [pypi-publish action][pypi-publish] versions before 1.14.2 used to bundle the `emSign` root CA trust store certificate through the `certifi` distribution. It has since been removed through the bundle and the new version no longer includes them. [pypi-publish]: https://github.com/marketplace/actions/pypi-publish ### Details The `certifi`-provided TLS trust store is typically used by many projects in the Python ecosystem, including Sigstore that [pypi-publish] relies on for Trusted Publishing and Digital Attestations. ### Related The external compromise is being tracked at https://emudhra.we-have-a-problem.com

Check your whole app

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References

Merged from GitHub Advisory Database, OSV. Last updated 31 Oct 2026. All vulnerabilities · RSS · JSON

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