CVE WatchJul 15, 2026

CVE-2026-1528

ImpactA server can reply with a WebSocket frame using the 64-bit length form and an extremely large length. undici's ByteParser overflows in

CVSS

7.5

High

EPSS

0.5%

p39

KEV

—

Exploit Today

0-100

Published: Mar 12, 2026 · Last modified: Jul 15, 2026 · CWE-248 · CWE-1284

EPSS · 30d

0.5%EPSS · 30 days0.5%

2026-06-302026-07-17

Technical description

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.

Official references

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