FKIE_CVE-2026-15007
Vulnerability from fkie_nvd - Published: 2026-07-17 16:17 - Updated: 2026-07-17 18:11
Severity
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.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "affected",
"product": "Enterprise Server",
"vendor": "GitHub",
"versions": [
{
"changes": [
{
"at": "3.17.18",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.17.17",
"status": "affected",
"version": "3.17.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.18.12",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.18.11",
"status": "affected",
"version": "3.18.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.19.9",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.19.8",
"status": "affected",
"version": "3.19.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.20.5",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.20.4",
"status": "affected",
"version": "3.20.0",
"versionType": "semver"
},
{
"changes": [
{
"at": "3.21.3",
"status": "unaffected"
}
],
"lessThanOrEqual": "3.21.2",
"status": "affected",
"version": "3.21.0",
"versionType": "semver"
}
]
}
],
"source": "product-cna@github.com"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"id": "CVE-2026-15007",
"lastModified": "2026-07-17T18:11:59.263",
"metrics": {
"cvssMetricV40": [
{
"cvssData": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 5.7,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "UNREPORTED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "HIGH",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "product-cna@github.com",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-15007",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-07-17T16:35:53.532624Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-07-17T16:17:13.743",
"references": [
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5"
},
{
"source": "product-cna@github.com",
"url": "https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3"
}
],
"sourceIdentifier": "product-cna@github.com",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-770"
}
],
"source": "product-cna@github.com",
"type": "Secondary"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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