CVE-2026-1528

Name	CVE-2026-1528
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
node-undici (PTS)	bookworm	5.15.0+dfsg1+~cs20.10.9.3-1+deb12u4	vulnerable
	bookworm (security)	5.15.0+dfsg1+~cs20.10.9.3-1+deb12u3	vulnerable
	trixie	7.3.0+dfsg1+~cs24.12.11-1	vulnerable
	forky, sid	7.18.2+dfsg+~cs3.2.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
node-undici	source	(unstable)	(unfixed)

Notes

https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
https://github.com/nodejs/undici/commit/5a97f0893b53ba7d1d5549d3df7e55d9c2673f89 (v6.24.0)
https://github.com/nodejs/undici/commit/84235c62e0fe7494cec13f81d5732db0859df417 (v7.24.0)