CVE-2026-75514: Bunkerity Bunkerweb

Medium severity, CVSS 5.9. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Bunkerity Bunkerweb: before 1.6.13 (fixed in 1.6.13)

Published 2026-08-20. Last modified 2026-09-18.