CVE-2026-96399

Summary

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 Software

Weaknesses

• CWE-125: CWE-125: Out-of-bounds Read
• CWE-248: CWE-248: Uncaught Exception

References

• https://github.com/go-gitea/gitea/security/advisories/GHSA-mw6q-qj47-9g5q
• https://github.com/go-gitea/gitea/pull/39354
• https://blog.gitea.com/release-of-28.0.0/
• https://github.com/go-gitea/gitea/releases/tag/v28.0.0

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