CVE-2026-75514 - BunkerWeb: rDNS bypass via missing forward-confirmation (FCrDNS) in blacklist, greylist, and antibot
Brief
CVE ID : CVE-2026-75514
Published : Aug. 20, 2026, 6:31 p. m.
- 37 minutes ago
Description : BunkerWeb is an open-source, next-generation Web Application Firewall. Prior to 1.
- 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.
- 13.
Severity: 0.0
- NA
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