CVE-2026-29075: Mesa: Checking out of untrusted code in `benchmarks.yml` workflow may lead to code execution in privileged runner

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-06 · updated 2026-06-17
Weakness: CWE-94

Description

Mesa is an open-source Python library for agent-based modeling, simulating complex systems and exploring emergent behaviors. In version 3.5.0 and prior, checking out of untrusted code in benchmarks.yml workflow may lead to code execution in privileged runner. This issue has been patched via commit c35b8cd.

Affected products

mesa: through 3.5.0

References

https://github.com/mesa/mesa/commit/c35b8cd67fc89dd680ae218e49b77f6e1ee07a27
https://github.com/mesa/mesa/security/advisories/GHSA-3j55-5q6x-2h48

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