{"data":{"id":"b6079e07-65c8-4170-b34f-db834d834039","title":"CVE-2026-31943: LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, `isPrivateIP()` in…","summary":"CVE-2026-31943 affects LibreChat before version 0.8.3. The function `isPrivateIP()` in `packages/api/src/auth/domain.ts` fails to detect IPv4-mapped IPv6 addresses in hex-normalized form. Any authenticated user can exploit this to bypass SSRF protection and make the server send HTTP requests to internal resources, including cloud metadata services such as `169.254.169.254`, loopback, and RFC1918 ranges.","solution":"Fixed in 0.8.3.","labels":["security"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31943","publishedAt":"2026-03-27T20:16:29.897Z","cveId":"CVE-2026-31943","cweIds":["CWE-918"],"cvssScore":"8.5","cvssSeverity":"high","severity":"high","attackType":["other"],"issueType":"vulnerability","affectedPackages":null,"affectedPackageNames":null,"affectedPackageRefs":null,"affectedVendors":[],"affectedVendorsRaw":["LibreChat"],"classifierModel":"claude-haiku-5-5","classifierPromptVersion":"v4","summaryPromptVersion":"v2","headline":"LibreChat SSRF protection bypass via IPv4-mapped IPv6 addresses","headlinePromptVersion":"h1","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N","attackVector":"network","attackComplexity":"low","privilegesRequired":"low","userInteraction":"none","exploitMaturity":"unknown","epssScore":0.00221,"epssCheckedAt":"2026-11-10T00:11:22.622Z","kevDateAdded":null,"advisoryAliases":null,"affectedPackagesSource":null,"affectedPackagesCheckedAt":"2026-11-03T18:10:50.169Z","patchAvailable":null,"disclosureDate":"2026-03-27T20:16:29.897Z","fixReleasedAt":null,"daysToFix":null,"fixCheckedAt":null,"capecIds":["CAPEC-664"],"crossRefCount":0,"attackSophistication":"moderate","impactType":["confidentiality","integrity"],"aiComponentTargeted":"api","llmSpecific":false,"classifierConfidence":0.85,"researchCategory":null,"atlasIds":null,"fixes":[]}}