Threat Intelligence / CVE / CVE-2026-58053

CVE-2026-58053 — Gitea act_runner

CVSS v3.1 9.9 (CRITICAL) · CVSS v4.0 9.4 · EPSS 0.2% (higher than 17.9% of all scored CVEs) · Priority 7.7/10 · Published 2026-06-28

As of 2026-06-30, CVE-2026-58053 is a CRITICAL-severity vulnerability in Gitea act_runner, CVSS v3.1 9.9, EPSS 0.2% (17.9th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-58053, most recently “Threat Actors Mass-Probe Gitea Docker Deployments for CVE-2026-20896 Authentication Bypass Amid Exploitarium Zero-Day Leak Wave”.

Last updated: 2026-06-30

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 77 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.

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

1 tracked threat in the Threadlinqs corpus references CVE-2026-58053, either in the campaign’s CVE list or as an indicator on the campaign record.

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 2026-07-07. This product uses the NVD API but is not endorsed or certified by the NVD.

Exploit and proof of concept

github.com — exploit

Third-party advisory

vulncheck.com — third party advisory

Full detection coverage & IOCs for threats exploiting CVE-2026-58053 are available via the Threadlinqs MCP server (Purple tier). View plans →

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