CVE-2026-15996Denial of service vulnerability in GitHub Enterprise Server allowed unauthenticated service disruption via deeply nested request parameters
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 6.6 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U
- Weakness (CWE)
- CWE-674
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_P
- NVD analysis
- Analyzed
- Record last updated
- Aug 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
GitHub Enterprise Server github:enterprise_server (from the name) | from 3.17.0 through 3.17.15; fixed at 3.17.16; from 3.18.0 through 3.18.9; fixed at 3.18.10; from 3.19.0 through 3.19.6; fixed at 3.19.7; from 3.20.0 through 3.20.2; fixed at 3.20.3 | CNA record |
github enterprise_server github:enterprise_server | before 3.17.16; from 3.18.0 before 3.18.10; from 3.19.0 before 3.19.7; from 3.20.0 before 3.20.3 | NVD |
References
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16release-notes, product
- https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10release-notes, product
- https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7release-notes, product
- https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3release-notes, product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.