# CVE-2026-27771

> As of 2026-09-13, CVE-2026-27771 is a HIGH-severity vulnerability, CVSS v3.1 8.2, EPSS 0.0% (14.0th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-27771, most recently “Threat Actors Mass-Probe Gitea Docker Deployments for CVE-2026-20896 Authentication Bypass Amid Exploitarium Zero-Day Leak Wave”.

**Last updated:** 2026-09-13

## What is CVE-2026-27771?

CVE-2026-27771 is an access-control / authorization flaw in the built-in package and container (OCI) registry of Gitea (and the Forgejo fork). When a repository or package was marked "private," the registry-side permission check was missing or bypassable, so the OCI Distribution Spec endpoints continued to serve image manifests and layers (and package source content) to unauthenticated/anonymous requests. As a result, any unauthenticated remote attacker could pull private container images and package artifacts using standard Docker/OCI pull commands without an account, token, or prior access. The flaw existed for roughly four years and is estimated to have affected ~30,000+ internet-facing instances across 30+ countries (concentrations in China, the U.S., Germany, France, and the U.K.). It was discovered by NoScope and responsibly disclosed to Gitea maintainers. Affected: Gitea versions prior to 1.26.2 (and equivalent Forgejo builds). Fixed in Gitea v1.26.2 via PR #37610, which adds the private/internal package label and fixes the package-source permission check.

No weakness class, CVSS vector or affected-product list has been recorded for CVE-2026-27771 beyond the description above.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 8.2 — HIGH
- **EPSS (FIRST):** 0.0% probability of exploitation in the next 30 days, higher than 14.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability

## Is CVE-2026-27771 being exploited?

It currently carries a trending score of 9 in the Threadlinqs vulnerability feed.

## Affected products and versions

No affected-product or package list has been recorded for CVE-2026-27771 in the tracked sources. The vendor advisory and the references below are the authoritative statement of what is affected.

## How to fix CVE-2026-27771

No vendor patch reference has been recorded for CVE-2026-27771 in the tracked sources. Follow the references below for a fix, and treat any affected deployment as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-27771

2 tracked threats in the Threadlinqs corpus reference CVE-2026-27771, 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
- [Gitea Container Registry Authorization Bypass (CVE-2026-27771) — Unauthenticated Pull of Private Container Images Across 31,000+ Self-Hosted Instances](https://intel.threadlinqs.com/threat/TL-2026-0602) — HIGH · 2026-05-27

## Sources

Seeded from `research_verified` and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

- [thehackernews.com](https://thehackernews.com/2026/05/gitea-vulnerability-exposes-private.html)
- [horizon3.ai](https://horizon3.ai/attack-research/vulnerabilities/cve-2026-27771/)
- [blog.gitea.com](https://blog.gitea.com/release-of-1.26.2/)
- [securityweek.com](https://www.securityweek.com/gitea-vulnerability-exposed-30000-deployments-to-attacks/)
- [github.com](https://github.com/go-gitea/gitea/pull/37610)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-27771
Full detection coverage and IOCs for threats exploiting CVE-2026-27771 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp