# CVE-2026-15007: Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via deeply nested YAML in release notes configuration

> CVE-2026-15007: Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via deeply nested YAML in release notes configuration. CVSS 5.7 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-15007
Last updated: 2026-10-24T20:10:00Z

- Published: 2026-07-17 15:16 UTC · Updated: 2026-10-24 20:10 UTC · Assigner: GitHub\_P
- CVSS: 5.7 (CVSS 4.0) · Severity: Medium
- EPSS: 0.64%, 50th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-770

## Description

A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to cause service disruption by supplying a repository release notes configuration file containing deeply nested YAML. When release notes were generated, the configuration file was parsed without a nesting depth limit, causing excessive resource consumption that could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. This vulnerability was reported via the GitHub Bug Bounty program.

## Affected vendors and products

- GitHub: Enterprise Server

## Tracked companies

- [GitHub](https://rewindex.com/company/github.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-15007)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-15007)
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes\#3.17.18](https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18)
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes\#3.18.12](https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12)
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes\#3.19.9](https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9)
- [https://docs.github.com/en/enterprise-server@3.20/admin/release-notes\#3.20.5](https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5)
- [https://docs.github.com/en/enterprise-server@3.21/admin/release-notes\#3.21.3](https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-15007 · Markdown: https://rewindex.com/cve/CVE-2026-15007.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-15007 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:46.151Z