# CVE-2026-58053 — Gitea act_runner

> 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](https://cwe.mitre.org/data/definitions/269.html). 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](https://github.com/trickest/cve/blob/main/2026/CVE-2026-58053.md) (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](https://intel.threadlinqs.com/threat/TL-2026-1136) — 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](https://github.com/bikini/exploitarium/tree/main/gitea-act-runner-container-options-poc)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/gitea-act-runner-container-hardening-bypass-via-workflow-container-options)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-58053
Full detection coverage and IOCs for threats exploiting CVE-2026-58053 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp