Gogs up to 0.14.2 markup.go special elements used in a template engine

Summaryinfo

A vulnerability was found in Gogs up to 0.14.2. It has been classified as problematic. The impacted element is an unknown function of the file internal/markup/markup.go. This manipulation causes improper neutralization of special elements used in a template engine. This vulnerability is tracked as CVE-2026-52796. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability has been found in Gogs up to 0.14.2 and classified as problematic. Affected by this vulnerability is an unknown code block of the file internal/markup/markup.go. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. The CWE definition for the vulnerability is CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. As an impact it is known to affect availability. The summary by CVE is:

Gogs is an open source self-hosted Git service. Prior to 0.14.3, specially crafted issue index pattern can cause a panic when rendering, resulting in denial of service. In internal/markup/markup.go, RenderIssueIndexPattern renders the issue index pattern to a link using com.Expand, which is not safe: when the configured pattern contains an opening brace { but no closing brace }, strings.Index(template, "}") returns -1 and the subsequent slice template[:-1] triggers a panic. Once such a pattern is set, any page in the affected repository that contains an issue index reference such as #1 becomes unavailable. This vulnerability is fixed in 0.14.3.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-52796 since 06/08/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1221 according to MITRE ATT&CK.

Upgrading to version 0.14.3 eliminates this vulnerability.

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Productinfo

Name

• Gogs

Version

• 0.14.0
• 0.14.1
• 0.14.2

Website

• Product: https://github.com/gogs/gogs/

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