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CVE-2026-61812 is a security-filter evasion vulnerability in ModSecurity's HTML decoder. Missing support for HTML entities can allow encoded input to evade security filtering. An unauthenticated remote attacker could exploit the incomplete decoding to bypass filtering and affect integrity. The affected package is identified as mod_security on Amazon Linux and modsecurity-apache on Debian; Amazon Linux identifies httpd itself as unaffected.
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An HTML-decoding flaw in mod_security involving missing entity handling allows evasion. The advisory rates it Medium with a CVSS v3.1 score of 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N), indicating network accessibility without privileges or user interaction and low integrity impact. It was published and modified on October 2, 2026. Fixes for the listed Amazon Linux mod_security packages are pending; httpd is explicitly not affected.
A critical network-accessible vulnerability, rated CVSS 3.0 9.8, affecting the listed Debian Linux 12.0, 13.0, and 14.0 CPEs and the Debian modsecurity-apache package. The supplied information does not describe the underlying flaw type or impact beyond the CVSS confidentiality, integrity, and availability ratings.
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Cross-references every affected SKU, including bundled OEM variants.
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