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CVE-2026-1528 is a denial-of-service vulnerability in undici's WebSocket frame parsing logic. A malicious WebSocket peer can send a frame encoded with the 64-bit payload length form and specify an extremely large length value. When processing this input, undici's ByteParser overflows internal arithmetic, transitions into an invalid parser state, and throws a fatal TypeError. In affected deployments, this unhandled failure terminates the Node.js process using undici, allowing a remote endpoint to crash the client or application handling the WebSocket connection.
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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 public exploits tracked yet. Mallory keeps watching.
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.
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 a crafted WebSocket frame with a large length.
A denial-of-service vulnerability in undici triggered by a crafted WebSocket frame with a large length.
A denial of service vulnerability in Undici triggered by a crafted WebSocket frame with a large length.
A denial of service vulnerability in Undici triggered by a crafted WebSocket frame with a large length.
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.