---
id: CVE-2026-52796
title: Gogs has DoS in rendering issue index pattern
summary: Gogs has DoS in rendering issue index pattern
severity: low
cvss: 3.5
cwe:
  - CWE-1336
vendor: gogs
product: gogs.io/gogs
ecosystem: go
affected:
  - gogs.io/gogs <= 0.14.2
patched:
  - gogs.io/gogs 0.14.3
published: '2026-06-22'
updated: '2026-06-22'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-4j89-2c4f-44c6'
references:
  - url: 'https://github.com/gogs/gogs/security/advisories/GHSA-4j89-2c4f-44c6'
  - url: 'https://github.com/gogs/gogs/pull/8312'
  - url: >-
      https://github.com/gogs/gogs/commit/0529d95fc39f2b6d2997b19a2a12e24522684722
  - url: 'https://github.com/gogs/gogs/releases/tag/v0.14.3'
  - url: 'https://github.com/advisories/GHSA-4j89-2c4f-44c6'
tags:
  - ghsa
  - go
epss: 0.00284
epssPercentile: 0.18685
ingestedAt: '2026-06-29T13:24:35.483Z'
---

## Overview

### Summary
Special template of issue index pattern may cause panic.

### Details

in internal/markup/markup.go

```go
link = fmt.Sprintf(`<a href="%s">%s</a>`, com.Expand(metas["format"], metas), m)
```

Issue index pattern is rendered to link with `com.Expand`.

However, `com.Expand` is not safe.

```go
i = strings.Index(template, "}")
if s, ok := match[template[:i]]; ok {
```

when `{` is found but `}` not found, i comes to 1, template[:-1] will be called, and then panicked

![image](https://user-images.githubusercontent.com/38121125/285883766-64873c44-d325-44ce-96a8-badbaadab178.png)

finally, all pages than contains issue index are unavailable.

### PoC

1. set issue index pattern as follow

![image](https://user-images.githubusercontent.com/38121125/285878157-c5fe848e-0fbd-4fdb-92d4-5eb01df2b8ca.png)

2. add a commit which point to an issue in its msg

![image](https://user-images.githubusercontent.com/38121125/285879545-bc360503-49b9-453f-aa24-9a5c5a45cf10.png)

using `#1` above

### Impact

DoS that cause part of pages of the specify repo unavailable.

## Affected packages

- `gogs.io/gogs <= 0.14.2`

## Remediation

Upgrade to a patched release:

- `gogs.io/gogs 0.14.3`