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CVE-2026-46340 is an uncontrolled resource consumption vulnerability in Netty's SCTP transport module, io.netty:netty-transport-sctp. In affected versions prior to 4.1.135.Final and 4.2.15.Final, SCTP message reassembly for non-complete fragments repeatedly wraps the existing fragment accumulator together with each newly received fragment into a new CompositeByteBuf. This creates an unboundedly deep chain of nested composite buffers for a single stream. After many fragments, buffer operations such as readableBytes() and getBytes() must traverse the nested structure recursively, while each layer also retains references and component metadata. The implementation imposes no effective bound on fragment count, total accumulated bytes, or the number of stream identifiers tracked concurrently, allowing each stream to maintain its own growing reassembly state. A remote peer can exploit this by sending very small fragmented SCTP DATA chunks while never setting the complete flag, causing indefinite growth in memory usage and processing overhead during reassembly.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.