CVE-2026-103059— Gitea built-in SSH server authentication bypass through key case folding
Quick assessment
Affected
Gitea Gitea
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
当启用 Gitea 内置的 SSH 服务器（ ）时，系统通过 SQL 比较来查找提供的公钥的编码内容。在某些数据库（包括默认的 SQLite）中， 比较不区分大小写。攻击者若能构造出与另一用户已注册的 RSA 公钥大小写变体相同且能够推导出对应私钥的公钥，则该公钥可能被错误地匹配到受害者的账户，从而允许攻击者以该用户身份通过 SSH 进行认证。现已改为使用密钥指纹进行查找，以修复此问题。
Get alerts for future matching vulnerabilities
Log in to subscribe
I. Basic Information for CVE-2026-103059
Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗
Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.
Vulnerability Title
Gitea built-in SSH server authentication bypass through key case folding
Source: CVE Program / CVE List V5
Vulnerability 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 fingerprint.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-103059
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
Premium
No public POC found.
Login to generate AI POCIII. Intelligence Information for CVE-2026-103059
请登录查看更多情报信息。
Other References for CVE-2026-103059 (4)
-
https://github.com/go-gitea/gitea/releases/tag/v28.0.0 release-notes
-
https://blog.gitea.com/release-of-28.0.0/ release-notes
Same Patch Batch · Gitea · 2026-10-06 · 21 CVEs total
| CVE-2026-104632 | Gitea fork workflow approval bypass through cancel and rerun | |
| CVE-2026-73278 | Gitea WebAuthn bypass during OAuth and OIDC sign-in | |
| CVE-2026-79960 | Gitea deploy key pushes acting as the repository owner | |
| CVE-2026-70357 | Gitea repository migration SSRF through DNS rebinding | |
| CVE-2026-96580 | Gitea Actions memory exhaustion through large static matrices | |
| CVE-2026-96589 | Gitea private repository access retained after rejected transfer | |
| CVE-2026-96400 | Gitea migration SSRF to reserved addresses through ALLOWED_DOMAINS | |
| CVE-2026-96399 | Gitea denial of service through external issue tracker patterns | |
| CVE-2026-96404 | Gitea installer authentication bypass for existing accounts | |
| CVE-2026-104626 | Gitea fork workflow job revival through later approval | |
| CVE-2026-94205 | Gitea fork workflow approval bypass through maintainer-triggered events | |
| CVE-2026-104636 | Gitea SSRF through Git HTTP redirects in mirrors and fetches | |
| CVE-2026-101027 | Gitea migration SSRF through ALLOWED_DOMAINS address check bypass | |
| CVE-2026-101029 | Gitea migration and pull mirror SSRF through multi-answer DNS | |
| CVE-2026-95106 | Gitea review and execution mismatch through duplicate tree entries | |
| CVE-2026-95112 | Gitea issue reference parsing CPU exhaustion | |
| CVE-2026-89430 | Gitea push mirror SSRF and forced writes to internal Git hosts | |
| CVE-2026-103504 | Gitea API team demotion not applied to unit permissions | |
| CVE-2026-103667 | Gitea container registry stored XSS through blob media type | |
| CVE-2026-103670 | Gitea trusted workflow cancellation by unapproved fork runs |
IV. Related Vulnerabilities
Same product: Gitea
-
CVE-2026-73278
Gitea WebAuthn bypass during OAuth and OIDC sign-in -
CVE-2026-96589
Gitea private repository access retained after rejected tran -
CVE-2026-96580
Gitea Actions memory exhaustion through large static matrice -
CVE-2026-96404
Gitea installer authentication bypass for existing accounts -
CVE-2026-96400
Gitea migration SSRF to reserved addresses through ALLOWED_D
Same vendor: Gitea
-
CVE-2026-73278
Gitea WebAuthn bypass during OAuth and OIDC sign-in -
CVE-2026-96589
Gitea private repository access retained after rejected tran -
CVE-2026-96580
Gitea Actions memory exhaustion through large static matrice -
CVE-2026-96404
Gitea installer authentication bypass for existing accounts -
CVE-2026-96400
Gitea migration SSRF to reserved addresses through ALLOWED_D
V. Comments for CVE-2026-103059
No comments yet