CVE-2026-15007 json
Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via deeply nested YAML in release notes configuration
published 2026-07-17 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-45188
- cvss
- 5.7
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- GitHub Enterprise Server 3.17.18, 3.18.12, 3.19.9, 3.20.5, 3.21.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.64% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.7 | 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 |
| CNA | 4.0 | 5.7 | 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 |
Affected products
- GitHub Enterprise Server
Classification
- Weakness
-
- CWE-770 Allocation of Resources Without Limits or Throttling
References
-
docs.github.com
/en/enterprise-server@3.17/admin/release-notes#3.17.18
release-notes
-
docs.github.com
/en/enterprise-server@3.18/admin/release-notes#3.18.12
release-notes
-
docs.github.com
/en/enterprise-server@3.19/admin/release-notes#3.19.9
release-notes
-
docs.github.com
/en/enterprise-server@3.20/admin/release-notes#3.20.5
release-notes
-
docs.github.com
/en/enterprise-server@3.21/admin/release-notes#3.21.3
release-notes
Sources
- CVE List CVE-2026-15007
- NVD CVE-2026-15007
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.