{"id":"CVE-2026-75514","summary":"BunkerWeb: rDNS bypass via missing forward-confirmation (FCrDNS) in blacklist, greylist, and antibot","details":"BunkerWeb is an open-source, next-generation Web Application Firewall. Prior to 1.6.13, the blacklist, greylist, and antibot modules in src/common/core/blacklist/blacklist.lua, src/common/core/greylist/greylist.lua, and src/common/core/antibot/antibot.lua trust PTR suffix matches in IGNORE_RDNS, GREYLIST_RDNS, and ANTIBOT_IGNORE_RDNS without using get_ips to confirm that the hostname resolves to the client address. An unauthenticated remote attacker who controls a PTR record can spoof a trusted suffix to bypass rDNS-based blacklisting, gain greylist treatment, or skip an antibot challenge. This issue is fixed in version 1.6.13.","aliases":["GHSA-q54j-5484-pvjm"],"modified":"2026-08-22T03:58:16.748372144Z","published":"2026-08-20T18:31:51.527Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-350"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75514.json"},"references":[{"type":"WEB","url":"https://github.com/bunkerity/bunkerweb/releases/tag/v1.6.13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75514.json"},{"type":"ADVISORY","url":"https://github.com/bunkerity/bunkerweb/security/advisories/GHSA-q54j-5484-pvjm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75514"},{"type":"FIX","url":"https://github.com/bunkerity/bunkerweb/commit/1a97e5b3f977130a1b84507a9e1f703c8eec12eb"},{"type":"FIX","url":"https://github.com/bunkerity/bunkerweb/pull/3710"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/bunkerity/bunkerweb","events":[{"introduced":"0"},{"fixed":"1a97e5b3f977130a1b84507a9e1f703c8eec12eb"},{"fixed":"2ae80bbbe46e7253fd080df807dceb9d20a60a77"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.6.13"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v1.6.12","v1.6.11","v1.6.10","v1.6.9","v1.6.6","v1.6.8","v1.6.7","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.3","v1.5.2","v1.5.0","v1.4.2","v1.4.0","v1.3.2","v1.3.1","v1.3.0","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.2","v1.1.1","v1.1.0","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75514.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"}]}