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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.

PUBLISHED Reserved 2026-01-28 | Published 2026-03-12 | Updated 2026-03-13 | Assigner openjs




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-248 Uncaught exception

CWE-1284 Improper validation of specified quantity in input

Product status

Default status
unaffected

>= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0
affected

6.24.0: 7.24.0
unaffected

Credits

Matteo Collina remediation reviewer

Ulises Gascón remediation developer

References

github.com/...undici/security/advisories/GHSA-f269-vfmq-vjvj

hackerone.com/reports/3537648

cna.openjsf.org/security-advisories.html

cve.org (CVE-2026-1528)

nvd.nist.gov (CVE-2026-1528)

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