CVE WatchAug 20, 2026

CVE-2026-75514

BunkerWeb is an open-source, next-generation Web Application Firewall. Prior to 1.6.13, the blacklist, greylist, and antibot modules in src/

CVSS

5.9

Medium

EPSS

0.5%

p38

KEV

—

Exploit Today

0-100

Published: Aug 20, 2026 · Last modified: Aug 20, 2026 · CWE-350

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-08-212026-08-28

Technical description

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.

Official references

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