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CVE-2026-73856 is a response body inspection bypass in ModSecurity involving non-canonical Content-Type casing. Responses using such casing may evade body inspection, undermining response-side security enforcement. The affected ModSecurity versions and vulnerable function are not specified. The mod_security packages in Amazon Linux 2 Core, Amazon Linux 2023, and Amazon Linux 2027 Preview are identified as not affected.
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No public exploit code observed for this vulnerability.
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A response body inspection bypass involving non-canonical Content-Type casing. The advisory rates it Medium with a CVSS v3.1 score of 4.0, indicating network access, high attack complexity, no required privileges or user interaction, and low confidentiality impact. The listed mod_security packages for Amazon Linux 2, Amazon Linux 2023, and Amazon Linux 2027 Preview are explicitly marked Not Affected. The record was published and modified on October 2, 2026.
A critical, network-accessible vulnerability tracked as CVE-2026-73856 affecting Debian Linux versions 12.0, 13.0, and 14.0, with no privileges or user interaction required according to the supplied CVSS v3.0 vector. The content does not identify the affected component or flaw type.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.