What is CVE-2026-58053?
Gitea act_runner with the Docker backend (through act 0.262.0) passes a workflow's container.options string to the Docker job container's HostConfig and, when configured with privileged: false, forces only the Privileged flag off while merging options such as --pid=host, --cap-add, and --security-opt unchanged. A user who can run a workflow on a Docker-backed runner can create a job container with host namespaces and broad capabilities and escape to the host as root despite privileged mode being disabled.
The record classifies CVE-2026-58053 under weakness class CWE-269. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 126 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.9 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - CVSS v4.0 base score
- 9.4
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H - EPSS (FIRST)
- 0.2% probability of exploitation in the next 30 days, higher than 17.9% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 7.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-06-28, last modified 2026-06-30
Is CVE-2026-58053 being exploited?
Weaponised exploit code for CVE-2026-58053 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 45 in the Threadlinqs vulnerability feed.
- trickest/cve (trickest)
Affected products and versions
- Gitea: act_runner
How to fix CVE-2026-58053
No vendor patch reference has been recorded for CVE-2026-58053 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-58053
2 tracked threats in the Threadlinqs corpus reference CVE-2026-58053, either in the campaign’s CVE list or as an indicator on the campaign record.
- Exploitarium: Mass Public Disclosure of Unreported Zero-Day PoCs (libssh2 CVE-2026-55200, Gitea CVE-2026-20896 / CVE-2026-58053, 7-Zip, Docker, OpenVPN Connect, VLC, nmap) — HIGH · 2026-10-31
- Threat Actors Mass-Probe Gitea Docker Deployments for CVE-2026-20896 Authentication Bypass Amid Exploitarium Zero-Day Leak Wave — CRITICAL · 2026-07-06
Sources
Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.