CVE-2026-52796
Received Received - Intake
Denial of Service in Gogs via Malformed Issue Index Pattern

Publication date: 2026-06-24

Last updated on: 2026-06-24

Assigner: GitHub, Inc.

Description
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.
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Meta Information
Published
2026-06-24
Last Modified
2026-06-24
Generated
2026-06-25
AI Q&A
2026-06-25
EPSS Evaluated
N/A
NVD
CVE-2026-52796
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
gogs gogs to 0.14.3 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
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.
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Executive Summary

This vulnerability exists in Gogs, an open source self-hosted Git service, in versions prior to 0.14.3. It occurs when a specially crafted issue index pattern containing an opening brace '{' but no closing brace '}' is used. The function RenderIssueIndexPattern attempts to render this pattern into a link, but due to the missing closing brace, it triggers a panic in the code. This panic causes the affected page to become unavailable.

Impact Analysis

The vulnerability can cause a denial of service (DoS) condition. Specifically, when the problematic issue index pattern is set, any page in the affected repository that contains an issue index reference (such as #1) becomes unavailable due to the panic triggered during rendering.

Mitigation Strategies

To mitigate this vulnerability, upgrade Gogs to version 0.14.3 or later, where the issue with specially crafted issue index patterns causing a panic has been fixed.

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