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CVE-2026-46340 is an uncontrolled resource-consumption vulnerability in Netty's SCTP transport message reassembly. In vulnerable versions of netty-transport-sctp, SctpMessageCompletionHandler retains fragments for incomplete SctpMessage instances without adequate bounds. The original vulnerable implementation repeatedly combined the previous accumulator and each new fragment into another CompositeByteBuf, producing an increasingly deep composite chain. It imposed no limits on incomplete fragment count, aggregate bytes, or SCTP stream identifiers; a peer could continuously submit small DATA fragments without setting the complete flag. Subsequent hardening added limits on incomplete messages and fragments, but versions through 4.1.136.Final and 4.2.16.Final still lacked a limit on the aggregate byte size retained for incomplete messages. The complete fix adds cumulative buffered-byte accounting and rejects fragments that exceed the configured limit.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
29 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in Netty's netty-transport-sctp component where fragmented SCTP messages buffered by SctpMessageCompletionHandler can consume excessive heap or direct memory because limits tracked fragment/message counts rather than total buffered bytes, allowing attackers to trigger OutOfMemoryError via multiple SCTP associations.
A denial-of-service vulnerability in Netty's SCTP transport due to unbounded memory growth from SctpMessage fragments.
A Netty SCTP transport denial-of-service flaw caused by unbounded memory growth from SctpMessage fragments.
A Netty SCTP transport vulnerability that can cause denial of service due to unbounded memory growth from SctpMessage fragments.
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.