Revoked CA certificate in pypi-publish action trust store
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
- Spoofing
- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-295.
Summary
The pypa/gh-action-pypi-publish GitHub Action from 0 before 1.14.3 bundles the emSign root CA certificate in its trust store through the certifi distribution. Sigstore, which the action uses for Trusted Publishing and Digital Attestations for PyPI, relies on this trust store. The flaw is improper certificate validation (CWE-295) caused by trusting this CA certificate. The advisory notes that an external compromise is being tracked.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
Description from the GitHub 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
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | pypa/gh-action-pypi-publish (GitHub Actions) | before 1.14.3 | 1.14.3 | Patch available | GHSA-5xjx-3w67-w9x9 |
- pypa/gh-action-pypi-publish (GitHub Actions) Vendor— Affected before 1.14.3 Fixed in 1.14.3 Patch available GHSA-5xjx-3w67-w9x9
Remediation
Upgrade pypa/gh-action-pypi-publish to 1.14.3, which no longer includes the emSign root CA certificate in its trust store.
Written with Claude Haiku 5.5 from the sources below · 2026-10-30
- Fix · GHSA-5xjx-3w67-w9x9 pypa/gh-action-pypi-publish (GitHub Actions) Fixed in 1.14.3 Advisory →
Timeline
- 2026-10-30 Threatist record created from GHSA-5xjx-3w67-w9x9
References
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences