Modsecurity apache: [GHSA-qrch-pjfr-9g47: t:removeComments mishandles the character after a comment terminator, bypassing rules] (CVE-2026-104259)
Description
A vulnerability in modsecurity-apache identified as CVE-2026-104259 involves the t:removeComments function mishandling the character following a comment terminator, which can lead to bypassing security rules. This issue affects multiple specific versions of modsecurity-apache. The severity is assessed as medium. No CVSS score or vendor advisory patch information is provided.
Affected software
pkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/modsecurity?arch=source&distro=focalpkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/modsecurity?arch=source&distro=jammypkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/modsecurity?arch=source&distro=noblepkg:deb/ubuntu/modsecurity-apache?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/modsecurity?arch=source&distro=stonkingpkg:deb/ubuntu/modsecurity-apache?arch=source&distro=stonkingpkg:deb/ubuntu/modsecurity?arch=source&distro=resolutepkg:deb/ubuntu/modsecurity-apache?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-2026-104259 is a vulnerability in modsecurity-apache where the t:removeComments function incorrectly processes the character immediately after a comment terminator. This flaw allows attackers to bypass certain security rules enforced by modsecurity. The vulnerability affects numerous specific versions of modsecurity-apache, including versions 2.7.4-1 through 3.0.16-1 and various Ubuntu package builds. No detailed CVSS score or patch information is available from the provided data.
Potential Impact
The vulnerability enables bypassing of security rules in modsecurity-apache, potentially reducing the effectiveness of web application firewall protections. This could allow malicious payloads or requests to evade detection or blocking by modsecurity rules. However, no evidence of known exploits in the wild is reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch or official fix information is provided, users should monitor vendor channels for updates. Until a fix is available, carefully review and adjust modsecurity rules to mitigate potential bypasses if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-104259
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
Threat ID: 6ad3f4f32cdf04f6566575ed
Added to database: 10/17/2026, 22:21:39 UTC
Last enriched: 10/17/2026, 22:41:01 UTC
Last updated: 10/17/2026, 22:41:01 UTC
Views: 2
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