{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-15007","assignerOrgId":"82327ea3-741d-41e4-88f8-2cf9e791e760","state":"PUBLISHED","assignerShortName":"GitHub_P","dateReserved":"2026-07-07T21:23:32.045Z","datePublished":"2026-07-17T15:16:02.252Z","dateUpdated":"2026-07-17T16:39:17.312Z"},"containers":{"cna":{"providerMetadata":{"orgId":"82327ea3-741d-41e4-88f8-2cf9e791e760","shortName":"GitHub_P","dateUpdated":"2026-07-17T15:16:02.252Z"},"title":"Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via deeply nested YAML in release notes configuration","problemTypes":[{"descriptions":[{"lang":"en","cweId":"CWE-770","description":"CWE-770 Allocation of resources without limits or throttling","type":"CWE"}]}],"impacts":[{"capecId":"CAPEC-229","descriptions":[{"lang":"en","value":"CAPEC-229 Serialized Data Parameter Blowup"}]}],"affected":[{"vendor":"GitHub","product":"Enterprise Server","versions":[{"status":"affected","version":"3.17.0","lessThanOrEqual":"3.17.17","changes":[{"at":"3.17.18","status":"unaffected"}],"versionType":"semver"},{"status":"affected","version":"3.18.0","lessThanOrEqual":"3.18.11","changes":[{"at":"3.18.12","status":"unaffected"}],"versionType":"semver"},{"status":"affected","version":"3.19.0","lessThanOrEqual":"3.19.8","changes":[{"at":"3.19.9","status":"unaffected"}],"versionType":"semver"},{"status":"affected","version":"3.20.0","lessThanOrEqual":"3.20.4","changes":[{"at":"3.20.5","status":"unaffected"}],"versionType":"semver"},{"status":"affected","version":"3.21.0","lessThanOrEqual":"3.21.2","changes":[{"at":"3.21.3","status":"unaffected"}],"versionType":"semver"}],"defaultStatus":"affected"}],"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.","supportingMedia":[{"type":"text/html","base64":false,"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.<br><br>"}]}],"references":[{"url":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.18","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.12","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.9","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.5","tags":["release-notes"]},{"url":"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.3","tags":["release-notes"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"HIGH","exploitMaturity":"UNREPORTED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.7,"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"}}],"credits":[{"lang":"en","value":"Stanislav Valkanov (GitHub: svalkanov)","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-17T16:35:53.532624Z","id":"CVE-2026-15007","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-17T16:39:17.312Z"}}]}}