{"id":"CVE-2026-107336","summary":"Authentication Bypass by Spoofing in Malcolm","details":"Malcolm's front nginx reverse proxy defines a \"Dashboards → Arkime shortcut\" location using a case-insensitive regex matcher but a case-sensitive rewrite. A request whose path segment is not exact-lowercase (for example /IDDASH2ARK/...) enters the location (the matcher fires) but evades the rewrite (no redirect is issued), so nginx falls through to the location's proxy_pass to the Arkime backend. That location is the one proxied location in the shipped config that does not include the per-location authentication file, so the request reaches Arkime unauthenticated. The same location also forwards a client-supplied X-Forwarded-User header un-overwritten, and Arkime is configured to trust X-Forwarded-User as the authenticated username — so an unauthenticated network caller can reach the Arkime backend while supplying a forged, auto-provisioned identity.","aliases":["GHSA-7j32-cf27-cp6h"],"modified":"2026-10-10T02:47:27.329778168Z","published":"2026-10-08T17:20:46.517Z","database_specific":{"cwe_ids":["CWE-290","CWE-441","CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107336.json","cna_assigner":"icscert"},"references":[{"type":"WEB","url":"https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/107xxx/CVE-2026-107336.json"},{"type":"ADVISORY","url":"https://github.com/cisagov/Malcolm/security/advisories/GHSA-7j32-cf27-cp6h"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-107336"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/cisagov/malcolm","events":[{"introduced":"0"},{"last_affected":"2c19ef04d85230634ac70cc68b8f418a0666afec"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"26.07.1"}],"source":"AFFECTED_FIELD"}}],"versions":["v26.07.1","v26.07.0","v26.06.1","v26.06.0","v26.05.2","v6.4.2","v6.4.1","v6.4.0","v5.2.4","v5.2.3","v5.2.2","v5.2.1","v3.0.1","v3.0.0","v2.6.1","v2.6.0","v2.5.0","v2.4.2","v2.4.1","v2.4.0.1","v2.4.0","v2.3.0","v2.2.1","v2.2.0","v2.1.1","v2.1.0","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v2.0.0-pre1","v1.8.1","v1.8.0","v1.7.2","v1.7.1a","v1.7.1","v1.7.0","v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.0","v1.3.1","v1.3.0","v1.2.2","v1.2.1","v1.2.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-107336.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}