{"api_version":"1","generated_at":"2026-05-28T01:39:52+00:00","cve":"CVE-2026-8606","urls":{"html":"https://cve.report/CVE-2026-8606","api":"https://cve.report/api/cve/CVE-2026-8606.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-8606","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-8606"},"summary":{"title":"Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint","description":"A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.","state":"PUBLISHED","assigner":"GitHub_P","published_at":"2026-05-27 00:16:37","updated_at":"2026-05-27 00:16:37"},"problem_types":["CWE-918","CWE-918 CWE-918 Server-Side request forgery (SSRF)"],"metrics":[{"version":"4.0","source":"product-cna@github.com","type":"Secondary","score":"7","severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/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","data":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/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","baseScore":7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}},{"version":"4.0","source":"CNA","type":"CVSS","score":"7","severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","data":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"}}],"references":[{"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7","name":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10","name":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16","name":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3","name":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1","name":"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19","name":"https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19","refsource":"product-cna@github.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-8606","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-8606","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.21.0 3.21.1 semver","platforms":[]},{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.20.0 3.20.2 semver","platforms":[]},{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.19.0 3.19.6 semver","platforms":[]},{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.18.0 3.18.9 semver","platforms":[]},{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.17.0 3.17.15 semver","platforms":[]},{"source":"CNA","vendor":"GitHub","product":"Enterprise Server","version":"affected 3.16.0 3.16.18 semver","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"R31n","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"8606","cve":"CVE-2026-8606","epss":"0.000760000","percentile":"0.226870000","score_date":"2026-05-27","updated_at":"2026-05-28 00:02:12"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Enterprise Server","vendor":"GitHub","versions":[{"changes":[{"at":"3.21.1","status":"unaffected"}],"lessThan":"3.21.1","status":"affected","version":"3.21.0","versionType":"semver"},{"changes":[{"at":"3.20.3","status":"unaffected"}],"lessThanOrEqual":"3.20.2","status":"affected","version":"3.20.0","versionType":"semver"},{"changes":[{"at":"3.19.7","status":"unaffected"}],"lessThanOrEqual":"3.19.6","status":"affected","version":"3.19.0","versionType":"semver"},{"changes":[{"at":"3.18.10","status":"unaffected"}],"lessThanOrEqual":"3.18.9","status":"affected","version":"3.18.0","versionType":"semver"},{"changes":[{"at":"3.17.16","status":"unaffected"}],"lessThanOrEqual":"3.17.15","status":"affected","version":"3.17.0","versionType":"semver"},{"changes":[{"at":"3.16.19","status":"unaffected"}],"lessThanOrEqual":"3.16.18","status":"affected","version":"3.16.0","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"R31n"}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program."}],"value":"A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program."}],"impacts":[{"capecId":"CAPEC-664","descriptions":[{"lang":"en","value":"CAPEC-664 Server Side Request Forgery"}]},{"capecId":"CAPEC-492","descriptions":[{"lang":"en","value":"CAPEC-492 Regular Expression Exponential Blowup"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","description":"CWE-918 Server-Side request forgery (SSRF)","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-05-26T23:59:41.742Z","orgId":"82327ea3-741d-41e4-88f8-2cf9e791e760","shortName":"GitHub_P"},"references":[{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.21/admin/release-notes#3.21.1"},{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.3"},{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.7"},{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.10"},{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.16"},{"tags":["release-notes"],"url":"https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.19"}],"source":{"discovery":"UNKNOWN"},"title":"Server-Side Request Forgery in GitHub Enterprise Server via Advisory Package URL Endpoint","x_generator":{"engine":"Vulnogram 1.0.2"}}},"cveMetadata":{"assignerOrgId":"82327ea3-741d-41e4-88f8-2cf9e791e760","assignerShortName":"GitHub_P","cveId":"CVE-2026-8606","datePublished":"2026-05-26T23:59:41.742Z","dateReserved":"2026-05-14T15:28:24.899Z","dateUpdated":"2026-05-26T23:59:41.742Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 00:16:37","lastModifiedDate":"2026-05-27 00:16:37","problem_types":["CWE-918","CWE-918 CWE-918 Server-Side request forgery (SSRF)"],"metrics":{"cvssMetricV40":[{"source":"product-cna@github.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/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","baseScore":7,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"8606","Ordinal":"1","Title":"Server-Side Request Forgery in GitHub Enterprise Server via Advi","CVE":"CVE-2026-8606","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"8606","Ordinal":"1","NoteData":"A Server-Side Request Forgery (SSRF) vulnerability was identified in GitHub Enterprise Server that allowed an attacker to cause the server to issue HTTP requests to internal services via the security advisories package lookup feature. By directing requests to an internal management service and measuring response timing, an attacker could infer the values of sensitive environment variables, including signing secrets and private keys. Exploitation required GitHub Packages to be enabled; on instances not running in private mode the vulnerability was exploitable without authentication, otherwise any authenticated user could exploit it. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21.1 and was fixed in versions 3.20.3, 3.19.7, 3.18.10, 3.17.16, and 3.16.19. This vulnerability was reported via the GitHub Bug Bounty program.","Type":"Description","Title":"Server-Side Request Forgery in GitHub Enterprise Server via Advi"}]}}}