CVE-2026-96399

Analyzed Analyzed - Analysis Complete

BaseFortify

Publication date: 2026-10-06

Last updated on: 2026-10-13

Assigner: Gitea Limited

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.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-06

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-10-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-96399

EUVD

EUVD-2026-93921

Affected Vendors & Products

Vendor	Product	Version / Range
gitea	gitea	to 28.0.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.
CWE-248	An exception is thrown from a function, but it is not caught.

Attack-Flow Graph

Executive Summary

This vulnerability involves a flaw in Gitea's external issue tracker regular expression. The regex contains alternating capture groups that can produce invalid slice indexes when rendering issue references. This causes a runtime panic, crashing the Gitea process entirely.

Detection Guidance

This vulnerability can be detected by checking if your Gitea instance is running a version affected by the regex panic issue. Look for crashes when rendering issue references in repositories with external issue tracker settings. No specific commands are provided in the context.

Impact Analysis

An attacker with permission to edit a repository's external issue tracker settings could trigger this flaw. When Gitea renders matching content like a README, the instance crashes for all users, causing denial of service.

Compliance Impact

This vulnerability causes a runtime panic that terminates the Gitea process, leading to denial of service for all users. This could disrupt access to critical data, potentially violating availability requirements in GDPR and HIPAA.

Mitigation Strategies

Immediately update Gitea to the latest patched version to prevent the regex panic. Disable external issue tracker settings in repositories until patched. Monitor Gitea logs for crashes during issue reference rendering.

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