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 — CRITICAL · 2026-07-06
- Gitea Container Registry Authorization Bypass (CVE-2026-27771) — Unauthenticated Pull of Private Container Images Across 31,000+ Self-Hosted Instances — 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.
← all vulnerabilities · Markdown version · Threadlinqs Intelligence