Loading vulnerability…
CVE-2026-42587 is a decompression-limit enforcement vulnerability in Netty versions before 4.1.133.Final in the 4.1.x branch and 4.2.13.Final in the 4.2.x branch. HttpContentDecompressor accepts a maxAllocation parameter intended to limit decompression buffer allocation, but silently ignores this limit for Brotli, Zstandard, and Snappy content encodings. Gzip and deflate decoding correctly enforce the limit through ZlibDecoder. DelegatingDecompressorFrameListener contains the same flaw for HTTP/2 connections. Attacker-controlled compressed HTTP content can bypass the configured allocation limit and cause unbounded memory allocation and out-of-memory denial of service.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
If you can’t patch tonight, do this now.
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.
31 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remotely exploitable denial-of-service vulnerability in Netty versions before 4.2.13.Final and 4.1.133.Final. Brotli, zstd, and snappy decompression bypasses the configured maxAllocation limit, allowing compressed payloads to trigger unbounded memory allocation and out-of-memory denial of service. Both HttpContentDecompressor and the HTTP/2 DelegatingDecompressorFrameListener are affected. The reported CVSS v3 base score is 7.5 (High), with no authentication or user interaction required. Fixed versions are 4.2.13.Final and 4.1.133.Final.
A Netty denial-of-service vulnerability involving unbounded memory allocation during HTTP content decompression.
Denial of service in Netty through unbounded memory allocation during HTTP content decompression.
Netty denial of service through unbounded memory allocation during HTTP content decompression.
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.