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CVE-2026-19534 is a denial-of-service vulnerability in the undici WebSocket client. During the opening handshake, a server can send a Sec-WebSocket-Protocol header even when the client did not request a subprotocol. undici dereferences a null value while comparing that unsolicited value to the requested-subprotocol list, producing an uncaught TypeError in a microtask. Under default Node.js behavior, the exception terminates the entire process instead of failing only the WebSocket connection. Affected releases include undici 6.7.0 through 6.28.0, 7.0.0 through 7.29.0, and 8.0.0 through 8.10.1.
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No public exploit code observed for this vulnerability.
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23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in undici triggered through an unrequested WebSocket subprotocol. It affects Node.js 24 packages on Rocky Linux 8.
A denial-of-service vulnerability in undici that can be triggered through an unrequested WebSocket subprotocol.
A denial-of-service vulnerability in undici that can be triggered through an unrequested WebSocket subprotocol.
A vulnerability addressed by the AlmaLinux ALSA-2026:73428 security update for AlmaLinux 10 Node.js 24 packages. No vulnerability-specific technical details are provided.
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.