CVE•Published 2026-03-31•Modified 2026-04-06•1 article on news•6 live references•NVD data
CVE-2026-34041Nektos · Act
Vulnerability data via NVD (ingested)
CVSS v3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS percentile
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Weaknesses (CWE)
Description
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.
Timeline
Published 2026-03-31
Modified 2026-04-06
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-34041Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Nektos Act"All exposed Nektos Act instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Act"HTTP body or banner mentions "Act" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-34041Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-34041Censys host search filtered to this CVE id.
grep.app
CVE-2026-34041Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-34041GitHub code search for direct mentions.
Google dork
"CVE-2026-34041" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2026-34041 on GitHub.