6.6
Medium
CVE-2026-15996 A denial of service vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to…
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Enterprise Server 3.20 | 3.20.0 → 3.20.2 | No fix stated |
| Enterprise Server 3.19 | 3.19.0 → 3.19.6 | No fix stated |
| Enterprise Server 3.18 | 3.18.0 → 3.18.9 | No fix stated |
| Enterprise Server 3.17 | 3.17.0 → 3.17.15 | No fix stated |
Other CVEs of Enterprise Server
The 94 CVEs of Enterprise Server →
CVE-2026-118237
Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure of process memory in the Git service
5.3
Medium
CVE-2026-110288
Cross-site request forgery vulnerability in GitHub Enterprise Server allowed deletion of stored ChatOps configuration through the Management Console
5.3
Medium
CVE-2026-104608
Use-after-free vulnerability in GitHub Enterprise Server allowed remote code execution in the Git service
7.7
High
CVE-2026-96890
A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed a…
8.7
High