Modsecurity: [GHSA-5m93-4h75-3p2w: @rxGlobal PCRE2 error handling: match-limit fail-open and invalid-pattern crash] (CVE-2026-103932)
Description
A vulnerability in ModSecurity related to PCRE2 error handling can cause match-limit fail-open behavior and crashes due to invalid patterns. This affects multiple specific versions of ModSecurity. The severity is assessed as medium. No CVSS score or known exploits in the wild are reported.
Affected software
pkg:deb/ubuntu/modsecurity?arch=source&distro=focalpkg:deb/ubuntu/modsecurity?arch=source&distro=jammypkg:deb/ubuntu/modsecurity?arch=source&distro=noblepkg:deb/ubuntu/modsecurity?arch=source&distro=stonkingpkg:deb/ubuntu/modsecurity?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-103932 describes a vulnerability in ModSecurity's handling of PCRE2 errors. Specifically, improper error handling can lead to a match-limit fail-open condition, potentially bypassing intended pattern matching limits, and crashes triggered by invalid regular expression patterns. The issue affects several specific ModSecurity versions, including 3.0.3-1 through 3.0.16-1 and various build variants. No detailed CVSS score or exploit information is available.
Potential Impact
The vulnerability may allow ModSecurity to fail open on match limits, potentially reducing its effectiveness in blocking malicious requests. Additionally, crashes caused by invalid patterns could lead to denial of service conditions. There is no evidence of active exploitation in the wild.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should monitor vendor communications for updates. No specific mitigation steps are provided in the available data.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-103932
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
Threat ID: 6ad3f4f62cdf04f6566575f7
Added to database: 10/17/2026, 22:21:42 UTC
Last enriched: 10/17/2026, 22:42:18 UTC
Last updated: 10/17/2026, 22:42:18 UTC
Views: 2
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