Vulnerability Description
A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker processes by sending a crafted form-encoded HTTP POST request containing deeply nested parameters. Because request parameters were parsed before routing and authentication, any POST endpoint could be used to trigger the condition, which could render the instance unresponsive. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, and 3.17.16.
Related Weaknesses (CWE)
References
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3
FAQ
What is CVE-2026-15996?
CVE-2026-15996 is a documented vulnerability. A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to cause excessive CPU consumption and exhaust the pool of request-handling worker...
How severe is CVE-2026-15996?
CVSS scoring is not yet available for CVE-2026-15996. Check NVD for updates.
Is there a patch for CVE-2026-15996?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.