Modsecurity apache: [GHSA-cxqf-vgrr-xxrv: HTML decoder missing entities, leading to evasion] (CVE-2026-61812)
Description
CVE-2026-61812 is a medium severity vulnerability in modsecurity-apache where the HTML decoder is missing certain entities, which can lead to evasion of security controls.
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
This vulnerability involves the HTML decoder component of modsecurity-apache missing some HTML entities during decoding. This omission can allow attackers to evade detection or filtering mechanisms that rely on proper decoding of HTML entities. The issue affects multiple specific versions of modsecurity-apache as listed, but no CVSS score or detailed technical exploitation information is provided.
Potential Impact
The impact is that attackers may bypass security rules or filters implemented by modsecurity-apache due to incomplete HTML entity decoding, potentially allowing malicious payloads to pass undetected. There is no indication of active exploitation in the wild or further escalation impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor vendor communications for updates and consider additional detection or filtering controls as interim measures.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-61812
- 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: 6ad3f5cd2cdf04f656662940
Added to database: 10/17/2026, 22:25:17 UTC
Last enriched: 10/18/2026, 00:24:12 UTC
Last updated: 10/18/2026, 00:24:12 UTC
Views: 2
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