CVE-2026-34042

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
8.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
8.2
EG Score
8.2(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
37.3%
KEV
Not listed

Published

March 31, 2026

Last Modified

April 16, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
Patch available. Sources: github_release, github, github_commit.
github Patch Available

remote code execution possible -- actions/cache server allows malicious cache injection · Advisory · nektos/act · GitHub

https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825
github_release Patch Available

v0.2.86

Patch available: nektos/act v0.2.86

https://github.com/nektos/act/releases/tag/v0.2.86
github_commit

commit c28c27e141e8 (nektos/act)

Fix landed in nektos/act commit c28c27e141e8 — awaiting tagged release

https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/nektos/act—0.2.86—

Data Freshness Timeline

(refreshed 10× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-23 14:18 UTCEPSS rescore
  2. 2026-07-23 14:18 UTCEPSS rescore
  3. 2026-07-23 03:09 UTCEG score recompute
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  8. 2026-06-29 03:02 UTCOSV refresh
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  26. 2026-06-18 17:52 UTCEPSS rescore
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  74. 2026-05-20 19:52 UTCEG score recompute
  75. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34042?
CVE-2026-34042 is a high vulnerability published on March 31, 2026. 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…
When was CVE-2026-34042 disclosed?
CVE-2026-34042 was first published in the National Vulnerability Database on March 31, 2026, with the most recent update on April 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34042 actively exploited?
CVE-2026-34042 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34042?
CVE-2026-34042 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-34042?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34042, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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