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CVE-2026-44249 is a high-severity improper access control vulnerability in Netty's netty-handler module that affects IPv6 subnet-based filtering implemented through io.netty.handler.ipfilter.IpSubnetFilterRule. In vulnerable versions prior to 4.1.135.Final and 4.2.15.Final, the IPv6 comparison logic in IpSubnetFilterRule.compareTo() contains an incorrect masking operation that applies the network address where the subnet mask should be used, causing subnet membership checks to produce incorrect results. Supporting analysis also identifies a second IPv6-specific logic flaw in the conversion of IPv6 address bytes to BigInteger, where signed interpretation can mis-handle addresses in the upper IPv6 space. Either flaw can cause IPv6 subnet rules to evaluate incorrectly, allowing addresses outside the intended subnet policy to be treated as permitted. The issue affects deployments that rely on Netty subnet filter rules for IPv6 source-based access control.
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22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An access control bypass vulnerability in Netty's netty-handler component caused by an incorrect masking operation in IpSubnetFilterRule.compareTo(), allowing attackers to bypass IPv6 subnet filtering restrictions.
A high-severity access control bypass in Netty's netty-handler module caused by two logic errors in IPv6 subnet filtering within IpSubnetFilterRule, allowing remote unauthenticated attackers to bypass IPv6 source-address restrictions.
A Netty IPv6 access-control bypass vulnerability in IpSubnetFilterRule.compareTo() caused by incorrect subnet comparison logic.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
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YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
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