CVE-2026-34042 | nektos act up to 0.2.85 Docker Container authorization (ID 294)

VDB-354314 · CVE-2026-34042 · ID 294 NEKTOS ACT UP TO 0.2.85 DOCKER CONTAINER AUTHORIZATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.1 $0-$5k 1.65+ Summaryinfo A vulnerability, which was classified as critical, was found in nektos act up to 0.2.85. This issue affects some unknown processing of the component Docker Container Handler. Such manipulation leads to authorization. This vulnerability is traded as CVE-2026-34042. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component. Detailsinfo A vulnerability, which was classified as critical, has been found in nektos act up to 0.2.85. Affected by this issue is some unknown functionality of the component Docker Container Handler. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes: 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. The advisory is available at github.com. This vulnerability is handled as CVE-2026-34042 since 03/25/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. Upgrading to version 0.2.86 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c28c27e141e8b54f9853de82f421ee09846751f7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. Productinfo Vendor nektos Name act Version 0.2.0 0.2.1 0.2.2 0.2.3 0.2.4 0.2.5 0.2.6 0.2.7 0.2.8 0.2.9 0.2.10 0.2.11 0.2.12 0.2.13 0.2.14 0.2.15 0.2.16 0.2.17 0.2.18 0.2.19 0.2.20 0.2.21 0.2.22 0.2.23 0.2.24 0.2.25 0.2.26 0.2.27 0.2.28 0.2.29 0.2.30 0.2.31 0.2.32 0.2.33 0.2.34 0.2.35 0.2.36 0.2.37 0.2.38 0.2.39 0.2.40 0.2.41 0.2.42 0.2.43 0.2.44 0.2.45 0.2.46 0.2.47 0.2.48 0.2.49 0.2.50 0.2.51 0.2.52 0.2.53 0.2.54 0.2.55 0.2.56 0.2.57 0.2.58 0.2.59 0.2.60 0.2.61 0.2.62 0.2.63 0.2.64 0.2.65 0.2.66 0.2.67 0.2.68 0.2.69 0.2.70 0.2.71 0.2.72 0.2.73 0.2.74 0.2.75 0.2.76 0.2.77 0.2.78 0.2.79 0.2.80 0.2.81 0.2.82 0.2.83 0.2.84 0.2.85 License open-source Website Product: https://github.com/nektos/act/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.2 VulDB Meta Temp Score: 7.1 VulDB Base Score: 6.3 VulDB Temp Score: 6.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 8.2 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Authorization CWE: CWE-862 / CWE-863 / CWE-285 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: act 0.2.86 Patch: c28c27e141e8b54f9853de82f421ee09846751f7 Timelineinfo 03/25/2026 CVE reserved 03/31/2026 +5 days Advisory disclosed 03/31/2026 +0 days VulDB entry created 03/31/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: 294 Status: Confirmed CVE: CVE-2026-34042 (🔒) GCVE (CVE): GCVE-0-2026-34042 GCVE (VulDB): GCVE-100-354314 Entryinfo Created: 03/31/2026 08:13 Changes: 03/31/2026 08:13 (67) Complete: 🔍 Cache ID: 99:41A:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸