CVE-2026-34041

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 54% 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 weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: 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 unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an attacker can inject these commands to set arbitrary environment variables or modify the PATH for all subsequent steps in the job. This issue has been patched in version 0.2.86.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
46.0%
KEV
Not listed

Published

March 31, 2026

Last Modified

April 6, 2026

Advisory Details (3)

Auto-updated May 18, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

::set-env:: and ::add-path:: Workflow Commands Unconditionally Processed · Advisory · nektos/act · GitHub

https://github.com/nektos/act/security/advisories/GHSA-xmgr-9pqc-h5vw
generic

Release v0.2.86 · nektos/act · GitHub

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

Merge commit from fork · nektos/act@0c739c8 · GitHub

https://github.com/nektos/act/commit/0c739c8e39c41aa5a07665f732da9cab6df0097a

Affected Packages

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

Data Freshness Timeline

(refreshed 11× 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 102 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
  4. 2026-07-22 14:08 UTCEPSS rescore
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  6. 2026-07-20 17:08 UTCEPSS rescore
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  10. 2026-07-17 19:59 UTCOSV refresh
  11. 2026-07-16 17:03 UTCEPSS rescore
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  1. 2026-07-06 02:23 UTCEPSS rescore
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  5. 2026-06-30 23:22 UTCEPSS rescore
  6. 2026-06-29 17:32 UTCOSV refresh
  7. 2026-06-29 14:06 UTCEPSS rescore
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  23. 2026-06-21 01:59 UTCEPSS rescore
  24. 2026-06-19 19:25 UTCEPSS rescore
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  26. 2026-06-18 17:52 UTCEPSS rescore
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  30. 2026-06-15 17:49 UTCEPSS rescore
  31. 2026-06-14 23:18 UTCEPSS rescore
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  40. 2026-06-07 15:25 UTCEPSS rescore
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  55. 2026-06-01 05:13 UTCOSV refresh
  56. 2026-05-31 22:30 UTCEPSS rescore
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  72. 2026-05-20 22:38 UTCEPSS rescore
  73. 2026-05-20 22:38 UTCEPSS rescore
  74. 2026-05-20 19:52 UTCEG score recompute
  75. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34041?
CVE-2026-34041 is a critical 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 unconditionally processes the deprecated ::set-env:: and ::add-path:: workflow commands, which was disabled due to environment injection risks. When a workflow step echoes untrusted data to stdout, an…
When was CVE-2026-34041 disclosed?
CVE-2026-34041 was first published in the National Vulnerability Database on March 31, 2026, with the most recent update on April 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34041 actively exploited?
CVE-2026-34041 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 46.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-34041?
CVE-2026-34041 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-34041?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34041, 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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