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Vulnerability record · CVE-2026-34042 · published 31 March 2026

CVE-2026-34042: Missing authorization vulnerability

act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86.

8.2 CVSS 3.1 High EPSS 0.58% · top 54.6% CWE-862 · Missing authorization Deferred
8.2CVSS 3.1 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

act is a project which allows for local running of github actions. Prior to version 0.2.86, act's built in actions/cache server listens to connections on all interfaces and allows anyone who can connect to it including someone anywhere on the internet to create caches with arbitrary keys and retrieve all existing caches. If they can predict which cache keys will be used by local actions, they can create malicious caches containing whatever files they please most likely allowing arbitrary remote code execution within the docker container. This issue has been patched in version 0.2.86.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References

LinkTags
https://code.forgejo.org/forgejo/runner/issues/294
https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7
https://github.com/nektos/act/releases/tag/v0.2.86
https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825

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Source: NIST National Vulnerability Database (record CVE-2026-34042), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.