{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-101087","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-09-27T20:29:07.432Z","datePublished":"2026-09-27T20:49:58.749Z","dateUpdated":"2026-09-27T20:49:58.749Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-27T20:49:58.749Z"},"datePublic":"2026-08-11T00:00:00.000Z","title":"Nezha 2.0.10 through 2.3.2 SSRF Denylist Bypass IPv6","descriptions":[{"lang":"en","value":"Nezha versions 2.0.10 through 2.3.2 use a restricted HTTP client to validate user-configurable notification and DDNS webhook URLs, but the denylist did not cover IPv6 transition ranges — specifically the 6to4 prefix 2002::/16 and the local-use IPv4/IPv6 translation prefix 64:ff9b:1::/48. Because such addresses satisfy Go's netip.Addr.IsGlobalUnicast check, the URL validator accepted them. An authenticated user able to configure a webhook may be able to cause the dashboard to issue requests to an otherwise restricted IPv6 endpoint, but only where the dashboard's network provides unusual or non-standards-compliant routing for these transition ranges; no direct path to an IPv4 metadata, loopback, or private-network HTTP request has been demonstrated. The issue is fixed in version 2.3.3 (commit d1fcde8e), which blocks both prefixes."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Server-Side Request Forgery (SSRF)","cweId":"CWE-918","type":"CWE"}]}],"affected":[{"vendor":"nezhahq","product":"nezha","defaultStatus":"unaffected","packageURL":"pkg:golang/github.com/nezhahq/nezha","versions":[{"version":"2.0.10","status":"affected","versionType":"semver","lessThan":"2.3.3"},{"version":"2.3.3","status":"unaffected","versionType":"semver"}]}],"metrics":[{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"LOW","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS"},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"format":"CVSS"}],"references":[{"url":"https://github.com/nezhahq/nezha/security/advisories/GHSA-jr2j-7hvh-h4q9","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-jr2j-7hvh-h4q9)"},{"url":"https://github.com/nezhahq/nezha/commit/d1fcde8e","tags":["patch"],"name":"Patch Commit"},{"name":"VulnCheck Advisory: Nezha 2.0.10 through 2.3.2 SSRF Denylist Bypass IPv6","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/nezha-2.0.10-through-2.3.2-ssrf-denylist-bypass-ipv6"}],"x_generator":{"engine":"vulncheck-endgame"}}}}