CVE-2026-103059
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
When Gitea's built-in SSH server is enabled (`START_SSH_SERVER = true`), the presented public key was looked up with an SQL `LIKE` comparison of its encoded content, which is case-insensitive on some databases, including the default SQLite. An attacker who can construct a case variant of another user's registered RSA public key for which they can derive the private key could have that key matched to the victim's account and authenticate over SSH as that user. Keys are now looked up by fingerprint.
Risk Assessment
Risk of unauthorized SSH access to user accounts, potentially leading to account takeover and data compromise, especially in multi-user environments.
Recommendation
Update Gitea to a version that looks up keys by fingerprint. If unable to update, consider disabling the built-in SSH server and using an external one.
Other vulnerabilities in Gitea
See all- CVE-2026-60004CriticalActively exploited
Gitea before version 1.27.1 allows remote code execution via the diffpatch API through Git hook installation.
- CVE-2026-58508Critical
Two SSRF vulnerabilities in Gitea migration/mirror (DNS rebinding + missing re-validation).
- CVE-2026-58443Critical
Public-only repository tokens can update private PR head branches.
- CVE-2026-58433Critical
The team-repository linking endpoint bypasses the RepoAdminChangeTeamAccess organization setting. This means a user without proper permissions can change repository-team assignments.
- CVE-2026-56750Critical
Theft of the Remember-Me token in Gitea does not invalidate the attacker's session, allowing continued unauthorized access.
- CVE-2026-56654Critical
The vulnerability allows privilege escalation via access token scope escalation in the API.
- CVE-2026-56443Critical
A public-only scope token can bypass restrictions on limited-visibility owners (Repository and Package categories) — residual after CVE-2026-25714 / PR #37118.
- CVE-2026-55982Critical
The OIDC userinfo endpoint returns identity claims without enforcing API token scopes.
- CVE-2026-58426Critical
The vulnerability in Gitea Actions Artifacts V4 stems from HMAC ambiguity in signed URLs, allowing cross-repository artifact read and cross-task upload-state write.
- CVE-2026-27780Critical
A vulnerability in Gitea before version 1.26.0 fails to close the connection on bufio.Scanner errors while processing pre-receive hook input, allowing oversized input to bypass branch-protection checks.
Original NVD description (English source)
When Gitea's built-in SSH server is enabled (`START_SSH_SERVER = true`), the presented public key was looked up with an SQL `LIKE` comparison of its encoded content, which is case-insensitive on some databases, including the default SQLite. An attacker who can construct a case variant of another user's registered RSA public key for which they can derive the private key could have that key matched to the victim's account and authenticate over SSH as that user. Keys are now looked up by fingerprint.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS