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CVE-2026-1526 is a denial-of-service vulnerability in the undici WebSocket client caused by unbounded memory consumption during processing of the permessage-deflate extension. When a WebSocket connection negotiates permessage-deflate, undici decompresses attacker-controlled compressed frames without enforcing a limit on the size of the decompressed output. The flaw is present in the PerMessageDeflate.decompress() method, which accumulates decompressed chunks in memory and concatenates them into a single Buffer without verifying that the total expanded size remains within a safe threshold. A malicious WebSocket peer can therefore send a small compressed payload that expands massively in memory, creating a decompression bomb condition.
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No public exploit code observed for this vulnerability.
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25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in undici via unbounded memory consumption during WebSocket permessage-deflate decompression.
A denial-of-service vulnerability in undici caused by unbounded memory consumption during WebSocket permessage-deflate decompression.
A denial of service vulnerability in Undici caused by unbounded memory consumption during WebSocket permessage-deflate decompression.
A denial of service vulnerability in Undici caused by unbounded memory consumption during WebSocket permessage-deflate 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.