GHSA-x34h-54cw-9825 · Severity: high · Ecosystem: go — act: actions/cache server allows malicious cache injection
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.
Conclusion & alert: CVE-2026-34042 is rated Low Risk (34.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.02%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-21 | 0.05% | 0.02% | -0.03% |
| 2 | 2026-03-31 | — | 0.05% | — |
Full EPSS history (2 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.2 | 3.1 | HIGH |
|
2.8 | 4.7 | [email protected] |
GHSA-x34h-54cw-9825 · Severity: high · Ecosystem: go — act: actions/cache server allows malicious cache injection
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||