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CVE-2026-56819 is a direct-memory leak in Netty HTTP/2 content decompression affecting versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final. Applications using DelegatingDecompressorFrameListener are vulnerable when an HTTP/2 DATA frame is processed for a stream whose decompressor has already closed. Http2Decompressor.decompress(...) calls decompressor.writeInbound(data.retain()) but fails to release the retained ByteBuf on the error path. A remote unauthenticated peer can leak one direct ByteBuf per DATA frame, eventually exhausting direct memory and crashing the JVM.
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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.
27 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Netty HTTP/2 memory-leak flaw involving DATA frames that can cause denial of service.
Netty HTTP/2 denial of service caused by a DATA-frame memory leak.
A denial-of-service vulnerability in Netty codec-http2 due to an HTTP/2 DATA-frame memory leak.
A Netty denial-of-service vulnerability caused by an HTTP/2 DATA frame memory leak.
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.