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CVE-2026-34042— act: actions/cache server allows malicious cache injection

Quick assessment

Affected
nektos act
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Act是nektos开源的一个本地运行GitHub Actions的工具。 Act 0.2.86之前版本存在安全漏洞，该漏洞源于内置的actions/cache服务器监听所有接口连接，可能导致任意缓存创建和检索，进而允许在Docker容器内执行任意远程代码。

CVSS 8.2 · High EPSS 0.58% · P46
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I. Basic Information for CVE-2026-34042

Vulnerability Information
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Vulnerability Title
act: actions/cache server allows malicious cache injection
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Act 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Act是nektos开源的一个本地运行GitHub Actions的工具。 Act 0.2.86之前版本存在安全漏洞，该漏洞源于内置的actions/cache服务器监听所有接口连接，可能导致任意缓存创建和检索，进而允许在Docker容器内执行任意远程代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nektos act < 0.2.86 -

II. Public POCs for CVE-2026-34042

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 10549 chars
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III. Intelligence Information for CVE-2026-34042

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Patches & Fixes for CVE-2026-34042 (1)

IV. Related Vulnerabilities

Same product: act
Same vendor: nektos
Same weakness: CWE-862

V. Comments for CVE-2026-34042

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