{"id":"CVE-2026-31943","summary":"LibreChat has SSRF protection bypass via IPv4-mapped IPv6 normalization in isPrivateIP","details":"LibreChat is a ChatGPT clone with additional features. Prior to version 0.8.3, `isPrivateIP()` in `packages/api/src/auth/domain.ts` fails to detect IPv4-mapped IPv6 addresses in their hex-normalized form, allowing any authenticated user to bypass SSRF protection and make the server issue HTTP requests to internal network resources — including cloud metadata services (e.g., AWS `169.254.169.254`), loopback, and RFC1918 ranges. Version 0.8.3 fixes the issue.","aliases":["GHSA-w5r7-4f94-vp4c"],"modified":"2026-04-10T05:42:12.265255Z","published":"2026-03-27T19:21:50.653Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31943.json","cwe_ids":["CWE-918"],"cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31943.json"},{"type":"ADVISORY","url":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-w5r7-4f94-vp4c"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31943"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/danny-avila/librechat","events":[{"introduced":"0"},{"fixed":"cfbe812d63451c1578faa9a13b7e77e0c9a9789b"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"0.8.3"}]}}],"versions":["chart-1.9.0","chart-1.9.1","chart-1.9.2","chart-1.9.3","chart-1.9.4","chart-1.9.5","chart-1.9.6","chart-1.9.7","chart-1.9.8","chart-1.9.9","librechat-1.8.9","v0.0.1","v0.0.2","v0.0.3","v0.0.6","v0.1.0","v0.1.1","v0.2.0","v0.3.0","v0.3.3","v0.4.0","v0.4.1","v0.4.2","v0.4.3","v0.4.4","v0.4.5","v0.4.6","v0.4.7","v0.4.8","v0.5.0","v0.5.1","v0.5.2","v0.5.3","v0.5.4","v0.5.5","v0.5.6","v0.5.7","v0.5.8","v0.5.9","v0.6.0","v0.6.1","v0.6.10","v0.6.5","v0.6.6","v0.6.9","v0.7.0","v0.7.1","v0.7.2","v0.7.3","v0.7.3-rc","v0.7.3-rc2","v0.7.4","v0.7.4-rc1","v0.7.5","v0.7.5-rc1","v0.7.5-rc2","v0.7.6","v0.7.6-rc1","v0.7.7","v0.7.7-rc1","v0.7.8","v0.7.8-rc1","v0.7.9","v0.7.9-rc1","v0.8.0","v0.8.0-rc1","v0.8.0-rc2","v0.8.0-rc3","v0.8.0-rc4","v0.8.1","v0.8.1-rc1","v0.8.1-rc2","v0.8.2","v0.8.2-rc1","v0.8.2-rc2","v0.8.2-rc3","v0.8.3-rc1","v0.8.3-rc2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31943.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N"}]}