CRITICAL

CVE-2026-103059

Gitea built-in SSH server authentication bypass through key case folding

CVSS v3

9.1

CRITICAL

EPSS Score

—

exploit probability

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

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 fingerprin

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published: 2026-10-06
Last Modified: 2026-10-07

Frequently asked questions

What is CVE-2026-103059?

Is CVE-2026-103059 actively exploited?

Active exploitation of CVE-2026-103059 has not been confirmed.

What is the CVSS score for CVE-2026-103059?

CVE-2026-103059 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

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