{"id":"CVE-2026-105689","summary":"Penpot: SSRF guard bypass via IPv6 transition addresses (NAT64/6to4/Teredo) in webhook delivery and media download","details":"Penpot is an open-source design and prototyping platform. Prior to 2.18.0, app.util.ssrf/blocked-address? relies on Java InetAddress predicates that do not classify NAT64, 6to4, or Teredo addresses and applies additional CIDR checks only to IPv4 values. Exploitation requires routing through a NAT64 gateway or an attacker-controlled DNS AAAA record; cloud environments with NAT64 gateways are directly exploitable. A user controlling a media import URL, or an administrator controlling a webhook URL, can then supply an IPv6 transition address that embeds a cloud-metadata, loopback, link-local, or private IPv4 target and bypasses the intended SSRF restrictions. Media import can disclose response bodies, while webhook delivery can expose response status as a network-probing side channel. This issue is fixed in version 2.18.0.","aliases":["GHSA-wxgm-8qjw-x445"],"modified":"2026-10-07T02:47:27.462740663Z","published":"2026-10-05T19:51:04.208Z","database_specific":{"cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105689.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/penpot/penpot/releases/tag/2.18.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-105689.json"},{"type":"ADVISORY","url":"https://github.com/penpot/penpot/security/advisories/GHSA-wxgm-8qjw-x445"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-105689"},{"type":"FIX","url":"https://github.com/penpot/penpot/commit/326d83e780ae120b45ccd6f3d7bd24922b54461c"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/penpot/penpot","events":[{"introduced":"0"},{"fixed":"326d83e780ae120b45ccd6f3d7bd24922b54461c"},{"fixed":"5baffdc213f0deaaeb318e97a41d611ac0656a94"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.18.0"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["2.18.0-RC7","2.18.0-RC6","2.18.0-RC4","2.18.0-RC3","2.18.0-RC2","2.17.1-RC5","2.18.0-RC1","2.17.1-RC4","2.17.1-RC3","2.17.1-RC2","2.17.1-RC1","2.17.0","2.17.0-RC6","2.17.0-RC5","2.17.0-RC4","2.17.0-RC3","2.17.0-RC1","2.16.1-RC2","2.16.0","2.16.0-RC13","2.16.0-RC11","2.16.0-RC9","2.16.0-RC8","2.16.0-RC7","2.16.0-RC6","2.16.0-RC5","2.16.0-RC4","2.16.0-RC3","2.16.0-RC2","2.16.0-RC1","2.15.0-RC1","2.14.0-RC4","2.14.0-RC3","2.14.0-RC2","2.14.0-RC1","2.10.0-RC1","2.7.0-RC1","2.6.0-RC1","2.5.0-RC1","2.5.0-DEV","pre-lazy-loading","1.14.1-beta","1.14.0-beta","1.9.0-alpha","1.8.2-alpha","1.8.1-alpha","1.8.0-alpha","1.7.4-alpha","1.7.3-alpha","1.7.2-alpha","1.7.1-alpha","1.7.0-alpha","1.6.5-alpha","1.6.4-alpha","1.6.3-alpha","1.6.2-alpha","1.6.1-alpha","1.6.0-alpha","1.5.4-alpha","1.5.3-alpha","1.5.2-alpha","1.5.1-alpha","1.5.0-alpha","1.4.1-alpha","1.4.0-alpha","1.4.0-dev","1.3.0-alpha","1.2.0-alpha","1.1.0-alpha","1.0.0-alpha","0.1.0","0.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-105689.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N"}]}