CVE-2026-29075Network attack vector

Runner code execution via untrusted pull-request checkout

Published Mar 6, 2026 · Updated Mar 6, 2026

Code injection in Mesa 3.5.0 and earlier allows remote attackers to execute arbitrary code in a privileged GitHub Actions runner. The benchmarks.yml workflow checks out a pull-request branch, then pip installs it and runs global_benchmark.py from that untrusted branch. Opening or marking a crafted pull request ready triggers the job, granting injected code the runner token's write access to issues and pull requests.

CVSS severity8.3
High
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Mesa 3.5.0 and earlier allows remote attackers to execute arbitrary code in a privileged GitHub Actions runner. The benchmarks.yml workflow checks out a pull-request branch, then pip installs it and runs global_benchmark.py from that untrusted branch. Opening or marking a crafted pull request ready triggers the job, granting injected code the runner token's write access to issues and pull requests.

The record

CVE
CVE-2026-29075
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
Mesa
Product
Mesa
Classifications
T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 3.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mesa · Mesaversion=<= 3.5.0

Published CVSS scores

8.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1059.006Command and Scripting Interpreter: Python

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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