{"id":"CVE-2026-85692","state":"PUBLISHED","title":"Nightingale 9.1.1 SSRF Guard Bypass via IPv6 Encoding","description":"Nightingale (n9e), as of commit 8362cbe (main branch, confirmed 2026-08-27), contains a server-side request forgery vulnerability in the isPublicIP function in aiagent/tools/http.go, the SSRF guard for the http_fetch AI-agent tool. The function only unwraps standard IPv4-mapped (::ffff:a.b.c.d) IPv6 addresses before checking them against the forbidden-range list, and does not classify 6to4 (2002::/16), NAT64 (64:ff9b::/96, 64:ff9b:1::/48), or deprecated site-local (fec0::/10) addresses. On a dual-stack or NAT64-enabled host, an attacker able to supply a URL to the http_fetch tool can bypass the guard by encoding a forbidden IPv4 address (such as the cloud instance-metadata endpoint 169.254.169.254) in one of these IPv6 forms to reach internal or metadata services.","publishedAt":"2026-09-04T14:32:36.023Z","updatedAt":"2026-09-04T17:43:52.393Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["ccfos nightingale"],"affected":[{"vendor":"ccfos","product":"nightingale","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"9.1.1","versionType":"semver"}]}],"references":["https://github.com/ccfos/nightingale/issues/3363","https://github.com/ccfos/nightingale","https://github.com/ccfos/nightingale/blob/v9.1.1/aiagent/tools/http.go","https://www.vulncheck.com/advisories/nightingale-9.1.1-ssrf-guard-bypass-via-ipv6-encoding"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/85xxx/CVE-2026-85692.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-85692","state":"PUBLISHED","datePublished":"2026-09-04T14:32:36.023Z","dateUpdated":"2026-09-04T17:43:52.393Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-09-04T13:51:44.996Z"},"containers":{"cna":{"title":"Nightingale 9.1.1 SSRF Guard Bypass via IPv6 Encoding","descriptions":[{"lang":"en","value":"Nightingale (n9e), as of commit 8362cbe (main branch, confirmed 2026-08-27), contains a server-side request forgery vulnerability in the isPublicIP function in aiagent/tools/http.go, the SSRF guard for the http_fetch AI-agent tool. The function only unwraps standard IPv4-mapped (::ffff:a.b.c.d) IPv6 addresses before checking them against the forbidden-range list, and does not classify 6to4 (2002::/16), NAT64 (64:ff9b::/96, 64:ff9b:1::/48), or deprecated site-local (fec0::/10) addresses. On a dual-stack or NAT64-enabled host, an attacker able to supply a URL to the http_fetch tool can bypass the guard by encoding a forbidden IPv4 address (such as the cloud instance-metadata endpoint 169.254.169.254) in one of these IPv6 forms to reach internal or metadata services."}],"affected":[{"vendor":"ccfos","product":"nightingale","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"9.1.1","versionType":"semver"}]}],"references":[{"url":"https://github.com/ccfos/nightingale/issues/3363","tags":["issue-tracking"],"name":"GitHub Issue #3363"},{"url":"https://github.com/ccfos/nightingale","tags":["product"]},{"url":"https://github.com/ccfos/nightingale/blob/v9.1.1/aiagent/tools/http.go","tags":["technical-description"]},{"url":"https://www.vulncheck.com/advisories/nightingale-9.1.1-ssrf-guard-bypass-via-ipv6-encoding","name":"VulnCheck Advisory: Nightingale 9.1.1 SSRF Guard Bypass via IPv6 Encoding","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-04T14:32:36.023Z"},"datePublic":"2026-08-29T00:00:00.000Z","credits":[{"lang":"en","value":"George Chen","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/ccfos/nightingale/issues/3363","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-04T17:43:27.970361Z","id":"CVE-2026-85692","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-04T17:43:52.393Z"}}]}}}