CVE-2026-109553 Details
Description
Gitea resolved the principals of an SSH certificate by searching the content of all stored public keys instead of only principal keys. When Gitea trusts a user certificate authority (`SSH_TRUSTED_USER_CA_KEYS`) and accepts arbitrary principals (`SSH_AUTHORIZED_PRINCIPALS_ALLOW=anything`), a user could register another user's public key line as their own principal, or a holder of a certificate signed by that authority could list it, and then authenticate as the owner of that key through the HTTP signature API and the built-in SSH server. Instances that do not trust a user certificate authority are not affected.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Oct 19, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://blog.gitea.com/release-of-28.2.0/ | Gitea Limited | |
| https://github.com/go-gitea/gitea/pull/39839 | Gitea Limited | |
| https://github.com/go-gitea/gitea/pull/39847 | Gitea Limited | |
| https://github.com/go-gitea/gitea/releases/tag/v28.2.0 | Gitea Limited | |
| https://github.com/go-gitea/gitea/security/advisories/GHSA-vcp6-2qc6-gvq3 | Gitea Limited |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | CISA-ADP |
Affected Products
No affected product data is available for this CVE.
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Oct 19, 2026 | CVE Modified | CISA-ADP |
| Oct 18, 2026 | New CVE Received | Gitea Limited |