PT-2026-28595 · Act · Act

Programmerjake · Published 2026-03-27 · Updated 2026-04-07 · CVE-2026-34042

Positive Technologies (AI Summary)

CVSS v3.1

8.2

High

Base vector

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

Name of the Vulnerable Software and Affected Versions act versions prior to 0.2.86

Description act, a project for running GitHub Actions locally, has an issue where the built-in actions/cache server listens on all interfaces, potentially allowing unauthorized access from the internet. This allows attackers to create caches with arbitrary keys and retrieve existing caches. If an attacker can predict the cache keys used by local actions, they can create malicious caches containing arbitrary files, potentially leading to arbitrary remote code execution within the Docker container.

Recommendations Update to version 0.2.86 or later.

Exploit

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-34042

GHSA-X34H-54CW-9825

GO-2026-4890

SUSE-SU-2026:1205-1

Affected Products

Act

References · 49

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34042.json · Exploit
• https://osv.dev/vulnerability/GO-2026-4890 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-34042 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-34042 · Security Note
• https://osv.dev/vulnerability/GHSA-x34h-54cw-9825 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:1205-1 · Vendor Advisory
• https://github.com/nektos/act · Note
• https://github.com/nektos/act/releases/tag/v0.2.86 · Note
• https://github.com/nektos/act/commit/c28c27e141e8b54f9853de82f421ee09846751f7 · Note
• https://github.com/nektos/act/security/advisories/GHSA-x34h-54cw-9825 · Note
• https://suse.com/security/cve/CVE-2026-34040 · Note
• https://suse.com/security/cve/CVE-2026-34041 · Note
• https://suse.com/security/cve/CVE-2026-32241 · Note
• https://suse.com/security/cve/CVE-2026-33028 · Note
• https://suse.com/security/cve/CVE-2026-33904 · Note