# CVE-2026-52796: Gogs denial of service via malformed issue index pattern

Source: https://junglewise.ai/threats/cve-2026-52796-gogs-denial-of-service-via-malformed-issue-index-pattern  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-24. Updated: 2026-06-24  
License: CC BY 4.0 with a link back

CVE-2026-52796 · Severity: low · CVSS 3.5 · Published 2026-06-24

Gogs is an open-source self-hosted Git service used by teams to manage source code. A vulnerability in how the system handles issue tracking patterns allows a user with repository access to crash the page rendering engine. This results in a denial-of-service where any page referencing an issue (such as commit logs or pull requests) becomes inaccessible to all users of that repository.

Technologies: [gogs.io/gogs (Go)](https://junglewise.ai/threats/technologies/gogs-io-gogs), [Gogs](https://junglewise.ai/threats/technologies/gogs). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Gogs](https://junglewise.ai/threats/vendors/gogs).

## Quick answers

**Is CVE-2026-52796 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-52796 being exploited in the wild.

**How severe is CVE-2026-52796?** Low severity, with a CVSS score of 3.5, published 24 June 2026.

**Which products and versions are affected?** gogs.io/gogs (Go) <= 0.14.2, SEMVER:introduced=0, SEMVER:introduced=0,fixed=0.14.3; Gogs < 0.14.3, <= 0.14.2.

**Is there a fix for CVE-2026-52796?** Yes. gogs.io/gogs (Go): upgrade to 0.14.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-52796 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-52796?** Check whether you run gogs.io/gogs (Go) or Gogs at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- gogs.io/gogs (Go): upgrade to 0.14.3 or later

  ```sh
  go get gogs.io/gogs@v0.14.3
  ```


## Technical details

A denial-of-service vulnerability exists in Gogs due to improper handling of template strings in the issue index pattern rendering logic. In `internal/markup/markup.go`, the `RenderIssueIndexPattern` function utilizes `com.Expand` to process patterns. If a configured pattern contains an opening brace '{' without a corresponding closing brace '}', `strings.Index` returns -1, leading to an out-of-bounds slice operation (`template[:-1]`) that triggers a Go panic. An attacker with repository-level privileges can configure a malicious pattern, causing any page containing an issue reference (e.g., #1) to fail to load. This issue is resolved in version 0.14.3.

## Affected products

- Gogs Gogs < 0.14.3

## Identifiers

- CVE-2026-52796
- GHSA-4j89-2c4f-44c6
- GO-2026-5124

## Timeline

- 2026-06-19: advisory: GitHub Security Advisory published
- 2026-06-24: disclosed: CVE published to NVD

## References

- [https://github.com/gogs/gogs/security/advisories/GHSA-4j89-2c4f-44c6](https://github.com/gogs/gogs/security/advisories/GHSA-4j89-2c4f-44c6)

## Related threats

- [Gogs Git Smart HTTP authorization bypass](https://junglewise.ai/threats/cve-2026-123012-in-gogs-0-14-3-the-git-smart-http-authorization-layer-in)
- [Gogs open redirect via backslash normalization mismatch](https://junglewise.ai/threats/cve-2026-82402-gogs-is-an-open-source-self-hosted-git-service-prior-to-0-15-0)
- [GO-2026-5193 - Gogs: XSS in .ipynb files renderer due to outdated notebookjs in gogs.io/gogs](https://junglewise.ai/threats/go-2026-5193-gogs-xss-in-ipynb-files-renderer-due-to-outdated-d1e8727f)
- [Gogs stored XSS in Jupyter Notebook sanitizer endpoint](https://junglewise.ai/threats/cve-2026-52816-gogs-stored-xss-in-jupyter-notebook-sanitizer-endpoint)
- [Gogs unauthenticated information disclosure in organization teams API](https://junglewise.ai/threats/cve-2026-52815-gogs-unauthenticated-information-disclosure-in-organization-teams)