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GitHub Enterprise Server CVE-2026-15007

| EUVDEUVD-2026-45188 MEDIUM
Allocation of Resources Without Limits or Throttling (CWE-770)
2026-07-17 GitHub_P
Denial Of Service Enterprise Server
5.7
CVSS 4.0 · Vendor: GitHub_P
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Severity by source

Vendor (GitHub_P) PRIMARY
5.7 MEDIUM
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
vuln.today AI
7.7 HIGH

Network-reachable, low complexity, requires authenticated low-privilege user; scope change (S:C) because instance-wide availability impact extends beyond the release notes component.

3.1 AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Primary rating from Vendor (GitHub_P).

CVSS VectorVendor: GitHub_P

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

1
Analysis Generated
Jul 17, 2026 - 16:16 vuln.today

DescriptionCVE.org

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.

AnalysisAI

GitHub Enterprise Server (all versions prior to 3.22) is vulnerable to authenticated denial of service via unbounded YAML parsing depth in release notes configuration files. An authenticated user with repository access can craft a release notes configuration file containing arbitrarily deeply nested YAML structures; when release note generation is triggered, the YAML parser processes the nesting without any depth limit, causing excessive CPU and memory consumption that can render the entire GHES instance unresponsive. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate to GHES instance
Delivery
Push deeply nested YAML to release notes config
Exploit
Trigger release notes generation for a repository tag
Execution
YAML parser recurses without depth limit
Persist
Instance processes exhaust CPU and memory
Impact
GHES instance becomes unresponsive for all users
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Vulnerability AssessmentAI

Exploitation Exploitation requires an authenticated session on the GHES instance with at minimum write access to a repository (sufficient to push a crafted release notes configuration file). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H) scores 5.7, which understates operational impact in enterprise deployments: a single authenticated user can fully crash a shared GHES instance, disrupting all development teams relying on it. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An authenticated developer or contractor with push access to any repository on a GHES instance creates a release notes configuration file (e.g., .github/release.yml) containing thousands of levels of nested YAML mappings. When the attacker or any automated process triggers release note generation for a tag or release, the GHES backend parses the file without depth limiting, causing the parser to exhaust available memory or stack space. …
Remediation The primary remediation is to upgrade to a patched release: 3.17.18, 3.18.12, 3.19.9, 3.20.5, or 3.21.3, depending on the currently deployed release train. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-15007 vulnerability details – vuln.today
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