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CVE-2026-42580 is an integer-overflow vulnerability in Netty's HTTP decoding component, netty-codec-http. The HttpObjectDecoder#getChunkSize method can silently overflow an integer when parsing HTTP chunk sizes, enabling HTTP request smuggling. The vulnerability affects Netty releases before 4.1.133.Final in the 4.1.x line and before 4.2.13.Final in the 4.2.x line.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer overflow in Netty's HTTP chunk-size parser enables request smuggling. The advisory assigns a CVSS v3 base score of 6.5 (Medium), with network access, no privileges, and no user interaction required. Exploits are available, but the content does not report active scanning or exploitation in the wild.
A previously disclosed Netty vulnerability mentioned only as part of vendor security history.
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.