CVE-2026-1528 — undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid st…
Published: 2026-03-12 · CVSS: 7.5 · CVSS 3.1
ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows internal math, ends up in an invalid state, and throws a fatal TypeError that terminates the process. Patches Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7