CVE-2026-15996

UNKNOWN 0.0

Denial of service vulnerability in GitHub Enterprise Server allowed unauthenticated service disruption via deeply nested request parameters

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-674
Vendor	github
Product	enterprise server
Ecosystems	DevTools
Industries	Technology
Published	Aug 5, 2026

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Affected Versions

GitHub / Enterprise Server

3.17.0 ≤ 3.17.15 3.18.0 ≤ 3.18.9 3.19.0 ≤ 3.19.6 3.20.0 ≤ 3.20.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

docs.github.com: https://docs.github.com/en/[email protected]/admin/release-notes#3.17.16 docs.github.com: https://docs.github.com/en/[email protected]/admin/release-notes#3.18.10 docs.github.com: https://docs.github.com/en/[email protected]/admin/release-notes#3.19.7 docs.github.com: https://docs.github.com/en/[email protected]/admin/release-notes#3.20.3