Out-of-bounds Read Affecting modsecurity package, versions <3.0.9-1+deb12u2


Severity

Recommended
0.0
high
0
10

Snyk's Security Team recommends NVD's CVSS assessment. Learn more

Threat Intelligence

EPSS
0.52% (42nd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ECHOLATEST-MODSECURITY-20360740
  • published1 Oct 2026
  • disclosed5 May 2026

Introduced: 5 May 2026

CVE-2026-30923  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Echo:latest modsecurity to version 3.0.9-1+deb12u2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream modsecurity package and not the modsecurity package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.

CVSS Base Scores

version 3.1