CVE-2026-103059
Gitea built-in SSH server authentication bypass through key case folding
Published Oct 6, 2026 · corrected/updated Oct 16, 2026 · gitea gitea · evidence confidence high
When Gitea's built-in SSH server is enabled ( ), the presented public key was looked up with an SQL 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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-103059 is a critical public vulnerability record for gitea gitea. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether gitea gitea is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: gitea (0 → 28.0.0); gitea/gitea. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 9.1, EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-305. Sources contributing to this record: cve_org, epss, github, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in the CISA KEV catalog.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 6, 2026 · NIST NVD
Detected
When Gitea's built-in SSH server is enabled ( ), the presented public key was looked up with an SQL 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 aut
Oct 15, 2026 · NIST NVD
Updated
When Gitea's built-in SSH server is enabled ( ), the presented public key was looked up with an SQL 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 aut
Oct 16, 2026 · GitHub Advisory Database
Fix available
gitea fixed in 28.0.0
Oct 16, 2026 · GitHub Advisory Database
Fix available
gitea fixed in 28.0.0
Oct 16, 2026 · GitHub Advisory Database
Updated
When Gitea's built-in SSH server is enabled ( ), the presented public key was looked up with an SQL 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 aut
Affected
- Bitnami gitea0 → 28.0.0
- cpe gitea/giteaversion unspecified
Sources
- CVE.orgVulnerability recordCVE-2026-103059
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-103059
30-day exploitation probability 0.3%
first.org - GitHub Advisory DatabasePackage advisoryGHSA-8pwg-hcgm-54cp
GitHub Advisory Database record mirrored by OSV.
github.com - NIST NVDVulnerability recordCVE-2026-103059
When Gitea's built-in SSH server is enabled ( ), the presented public key was looked up with an SQL comparison of its encoded content, which is case-insensitive on some databases, including the default SQLite. An attacker who can construct a case va
nvd.nist.gov - OSV.devPackage advisoryBIT-gitea-2026-103059
Gitea built-in SSH server authentication bypass through key case folding
osv.dev