# CVE-2026-65820: aeon: Privileged GitHub Actions workflow allowed fork-controlled code execution

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

aeon is a scikit-learn compatible Python library for learning from time series. Prior to version 1.5.0, a GitHub Actions workflow used pull_request_target for pre-commit checks on pull requests from forks. In this configuration, fork-controlled code could be checked out and executed in a privileged context. The vulnerable workflow also generated/used elevated credentials and could automatically commit or push fixes back to pull request branches. This created a potential token exposure and repository write path if an attacker submitted a malicious fork pull request designed to execute during the privileged workflow run. This issue has been patched in version 1.5.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- aeon-toolkit / aeon: < 1.5.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-94

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/aeon-toolkit/aeon/security/advisories/GHSA-mhg2-mc45-wrjr (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/aeon-toolkit/aeon/pull/3394 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/aeon-toolkit/aeon/commit/99261e1355c89a316bf0824bb03f855c6aadae8f (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-65820; retrieved 2026-11-11; source updated 2026-11-11

Revision: 1fe3fdac08e32ba459c3e43fedcd653b16204770e4a818b387c3c900b71f5f74

Canonical: https://y2.dev/cve/CVE-2026-65820

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