Vulnerability · Published Oct 6, 2026 · Assigned by Gitea

CVE-2026-96399Gitea denial of service through external issue tracker patterns

High 7.5

In plain English

A high-severity out-of-bounds read in Gitea from Gitea. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 29% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.4%top 71.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

A repository's external issue tracker regular expression containing alternating capture groups could produce invalid slice indexes when Gitea rendered issue references, causing a runtime panic that terminated the Gitea process. A user who can edit a repository's external issue tracker settings could make any later rendering of matching content, such as viewing a README, crash the instance for all users.

Affected products (as reported)

Vendor	Product	Versions
Gitea	Gitea	0 – through 1.27.3

Weakness: CWE-125, CWE-248 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory GHSA-mw6q-qj47-9g5q vendor-advisory
Fix: go-gitea/gitea pull request #39354 patch
Gitea 28.0.0 release announcement release-notes
go-gitea/gitea v28.0.0 release release-notes