GitHubCVE-2026-15007
GitHub Enterprise Server: denial of service
Medium5.7CVE-2026-15007 · Published Jul 17, 2026
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 versions
| Package | Affected | Fixed in |
|---|---|---|
| Enterprise Server Product | >= 3.17.0, <= 3.17.17 | No fix yet |
| >= 3.18.0, <= 3.18.11 | No fix yet | |
| >= 3.19.0, <= 3.19.8 | No fix yet | |
| >= 3.20.0, <= 3.20.4 | No fix yet |
Details and references
- CVSS 4.0
- CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-770
- www.cve.org/CVERecord?id=CVE-2026-15007
- nvd.nist.gov/vuln/detail/CVE-2026-15007
- docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18
- docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12
- docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9
- docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5
- docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3
More GitHub advisories
All GitHub| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Aug 6 | Safe-outputs config emitter: JSON injection via templated values despite env-var indirection | High8.5 | v0.78.0 |
| Aug 5 | GitHub Enterprise Server: denial of service | Medium6.6 | No fix yet |
| Aug 5 | GitHub Enterprise Server: path traversal | High8.8 | No fix yet |
| Jul 17 | GitHub Enterprise Server: missing authorization | Medium5.3 | No fix yet |
| Jul 17 | GitHub Enterprise Server: path traversal | High8.6 | No fix yet |
| Jul 1 | GitHub Enterprise Server: improper authorization | Medium5.3 | No fix yet |