BunkerWeb Web Application Firewall Vulnerability in Blacklist and Antibot Modules
CVE-2026-75514

5.9MEDIUM

Key Information:

Vendor

Bunkerity

Status
Bunkerweb
Vendor
CVE Published:
20 August 2026

What is CVE-2026-75514?

BunkerWeb, an open-source web application firewall, contains a vulnerability in its blacklist, greylist, and antibot modules prior to version 1.6.13. The flaw arises from the mishandling of PTR suffix matches in various configurations, which allows unauthenticated remote attackers to spoof trusted suffixes. By exploiting this vulnerability, attackers can bypass reverse DNS-based blacklisting, gain unauthorized greylist treatment, or evade antibot challenges, potentially leading to compromised security measures. This issue has been addressed in version 1.6.13.

Affected Version(s)

bunkerweb < 1.6.13

References

https://github.com/bunkerity/bunkerweb/security/advisorie...
x_refsource_CONFIRM
https://github.com/bunkerity/bunkerweb/pull/3710
x_refsource_MISC
https://github.com/bunkerity/bunkerweb/commit/1a97e5b3f97...
x_refsource_MISC

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.