{"id":"CVE-2026-56676","state":"PUBLISHED","title":"9router: Image prefetch DNS rebinding allows SSRF to internal services","description":"9Router is an AI router & token saver. Prior to 0.5.2, 9router validates image URLs by resolving the host before fetching, but open-sse/translator/concerns/image.js performs the later server-side image fetch with a separate DNS resolution. An authenticated attacker with access to the LLM proxy can use a vision-capable model and an attacker-controlled DNS name that first resolves to a public IP and then rebinds to an internal address, allowing server-side requests to internal-only HTTP services. This issue is fixed in version 0.5.2.","publishedAt":"2026-07-10T15:30:49.514Z","updatedAt":"2026-07-13T18:11:54.297Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["decolua 9router"],"affected":[{"vendor":"decolua","product":"9router","versions":[{"version":"< 0.5.2","status":"affected"}]}],"references":["https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx","https://github.com/decolua/9router/commit/c7d07448c58bec1200741de0b73305b860416b82","https://github.com/decolua/9router/releases/tag/v0.5.2"],"weaknesses":["CWE-367","CWE-918"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/56xxx/CVE-2026-56676.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56676","state":"PUBLISHED","datePublished":"2026-07-10T15:30:49.514Z","dateUpdated":"2026-07-13T18:11:54.297Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-22T16:39:01.044Z"},"containers":{"cna":{"title":"9router: Image prefetch DNS rebinding allows SSRF to internal services","descriptions":[{"lang":"en","value":"9Router is an AI router & token saver. Prior to 0.5.2, 9router validates image URLs by resolving the host before fetching, but open-sse/translator/concerns/image.js performs the later server-side image fetch with a separate DNS resolution. An authenticated attacker with access to the LLM proxy can use a vision-capable model and an attacker-controlled DNS name that first resolves to a public IP and then rebinds to an internal address, allowing server-side requests to internal-only HTTP services. This issue is fixed in version 0.5.2."}],"affected":[{"vendor":"decolua","product":"9router","versions":[{"version":"< 0.5.2","status":"affected"}]}],"references":[{"url":"https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx","name":"https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/decolua/9router/commit/c7d07448c58bec1200741de0b73305b860416b82","name":"https://github.com/decolua/9router/commit/c7d07448c58bec1200741de0b73305b860416b82","tags":["x_refsource_MISC"]},{"url":"https://github.com/decolua/9router/releases/tag/v0.5.2","name":"https://github.com/decolua/9router/releases/tag/v0.5.2","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-367","lang":"en","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","type":"CWE"}]},{"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":"2026-07-10T15:30:49.514Z"},"source":{"advisory":"GHSA-cmhj-wh2f-9cgx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/decolua/9router/security/advisories/GHSA-cmhj-wh2f-9cgx","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-13T18:11:05.854652Z","id":"CVE-2026-56676","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":"2026-07-13T18:11:54.297Z"}}]}}}