CVE-2026-52796 Gogs: DoS in rendering issue index pattern
Attackers can cause a denial of service in Gogs by configuring a malformed issue index pattern that triggers a panic during rendering.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-52796?
CVE-2026-52796 is a low-severity denial of service vulnerability in gogs, published on 24 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-1336
Which versions are affected by CVE-2026-52796?
3 open source packages ship an affected version, including gogs.io/gogs.
| Package | Affected | Fixed in |
|---|---|---|
gogs.io/gogs Go | All versions | None |
gogs.io/gogs Go | All versions | 0.14.3 |
gogs.io/gogs Go | All versions | 0.14.3 |
How do I fix CVE-2026-52796?
Upgrade gogs.io/gogs to 0.14.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-52796 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-52796 exists.
Sources
Also known as GHSA-4j89-2c4f-44c6, GO-2026-5124.