{"id":"CVE-2026-42596","state":"PUBLISHED","title":"Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook","description":"Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0.","publishedAt":"2026-05-14T15:19:34.999Z","updatedAt":"2026-05-15T16:04:05.815Z","severity":{"score":9.4,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["gotenberg gotenberg"],"affected":[{"vendor":"gotenberg","product":"gotenberg","versions":[{"version":"< 8.31.0","status":"affected"}]}],"references":["https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42596.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42596","state":"PUBLISHED","datePublished":"2026-05-14T15:19:34.999Z","dateUpdated":"2026-05-15T16:04:05.815Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-29T00:31:15.724Z"},"containers":{"cna":{"title":"Gotenberg: Unauthenticated SSRF via default deny-list bypass in downloadFrom and webhook","descriptions":[{"lang":"en","value":"Gotenberg is a Docker-powered stateless API for PDF files. Prior to 8.31.0, the default deny-lists used by Gotenberg's downloadFrom feature and webhook feature are bypassable. Because the filter is regex-based and case-sensitive, an unauthenticated attacker can supply URLs such as http://[::ffff:127.0.0.1]:... and reach loopback or private HTTP services that the default deny-list is intended to block. This crosses a real security boundary because an external caller can force the server to make outbound requests to internal-only targets. This vulnerability is fixed in 8.31.0."}],"affected":[{"vendor":"gotenberg","product":"gotenberg","versions":[{"version":"< 8.31.0","status":"affected"}]}],"references":[{"url":"https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h","name":"https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.4,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-14T15:19:34.999Z"},"source":{"advisory":"GHSA-4vmc-gm8v-m35h","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/gotenberg/gotenberg/security/advisories/GHSA-4vmc-gm8v-m35h","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-15T16:03:36.707460Z","id":"CVE-2026-42596","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-15T16:04:05.815Z"}}]}}}