CVE-2026-15007 | A denial of service vulnerability was identified in GitHub E… | CVSS 5.7 MEDIUM

Description

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.

Metadata

CVE ID: CVE-2026-15007
State: PUBLISHED
Assigner: GitHub_P
Reserved: 2026-07-07 21:23 UTC
Published: 2026-07-17 15:16 UTC
Last updated: 2026-07-17 16:39 UTC
Primary CWE: CWE-770
CWE-770 Allocation of resources without limits or throttling
Vendor / Product: GitHub / Enterprise Server
Sources: cve.org · NVD

Severity & Metrics

5.7 MEDIUM CVSS 4.0

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
GitHub	Enterprise Server	—	3.17.0 ≤ 3.17.17, 3.18.0 ≤ 3.18.11, 3.19.0 ≤ 3.19.8, 3.20.0 ≤ 3.20.4 …

Weakness (CWE)

CWE	Source	Description
CWE-770	cna	CWE-770 Allocation of resources without limits or throttling

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.7	MEDIUM	4.0	cna	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

References (5)