{"id":"CVE-2026-31945","summary":"LibreChat Server-Side Request Forgery using DNS resolution","details":"LibreChat is a ChatGPT clone with additional features. Versions 0.8.2-rc2 through 0.8.2 are vulnerable to a server-side request forgery (SSRF) attack when using agent actions or MCP. Although a previous SSRF vulnerability (https://github.com/danny-avila/LibreChat/security/advisories/GHSA-rgjq-4q58-m3q8) was reported and patched, the fix only introduced hostname validation. It does not verify whether DNS resolution results in a private IP address. As a result, an attacker can still bypass the protection and gain access to internal resources, such as an internal RAG API or cloud instance metadata endpoints. Version 0.8.3-rc1 contains a patch.","aliases":["GHSA-f92m-jpv7-55p2"],"modified":"2026-08-12T03:51:34.268432670Z","published":"2026-03-27T19:23:53.395Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-918"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31945.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31945.json"},{"type":"ADVISORY","url":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f92m-jpv7-55p2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31945"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/danny-avila/librechat","events":[{"introduced":"24e8a258cd8fa1ff42c02cf15408079f1dbe07b0"},{"fixed":"9eeec6bc4f5e856ac65f50784254d484b2808622"}],"database_specific":{"cpe":["cpe:2.3:a:librechat:librechat:0.8.2:-:*:*:*:*:*:*","cpe:2.3:a:librechat:librechat:0.8.2:rc2:*:*:*:*:*:*","cpe:2.3:a:librechat:librechat:0.8.2:rc3:*:*:*:*:*:*"],"extracted_events":[{"introduced":"0.8.2-rc2"},{"fixed":"0.8.3-rc1"},{"introduced":"0.8.2-NA"},{"last_affected":"0.8.2-NA"},{"last_affected":"0.8.2-rc2"},{"introduced":"0.8.2-rc3"},{"last_affected":"0.8.2-rc3"}],"source":["AFFECTED_FIELD","CPE_STRING"]}}],"versions":["0.8.2-NA","0.8.2-rc2","0.8.2-rc3","v0.8.2","chart-1.9.7","v0.8.2-rc3","chart-1.9.6","v0.8.2-rc2","chart-1.9.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-31945.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}