CVE-2026-58421 Unauthenticated ReDoS via CODEOWNERS pattern matching allows denial of service
Unauthenticated attackers can cause denial of service in Gitea by exploiting ReDoS vulnerabilities in CODEOWNERS pattern matching.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58421?
CVE-2026-58421 is a high-severity denial of service vulnerability in Gitea Open Source Git Server, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Unauthenticated ReDoS via CODEOWNERS pattern matching allows denial of service
Weakness: CWE-284
Which versions are affected by CVE-2026-58421?
3 open source packages ship an affected version, including code.gitea.io/gitea.
| Package | Affected | Fixed in |
|---|---|---|
code.gitea.io/gitea Go | All versions | 1.26.4 |
code.gitea.io/gitea Go | All versions | 1.26.4 |
code.gitea.io/gitea Go | All versions | 1.26.4 |
How do I fix CVE-2026-58421?
Upgrade code.gitea.io/gitea to 1.26.4 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-58421 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-58421 exists.
Sources
Also known as GHSA-v96j-25gv-g2w9, GO-2026-6077.