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CVE-2026-1528

undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client

Published: Mar 12, 2026Updated: Mar 20, 2026 Sources: CVE List NVD GHSACWE-248
7.5HIGH
NVD MITRE
EPSS Score
0.3%
Top 74.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-248CWE-1284

Affected Products

undicinodejsOSS Libraries
undicinpmOSS Libraries
undiciundici
On-prem
OSS Libraries / npm
nodejsoss-projectUSOSS Librariesaka node.js, node
npmpackage-ecosystemOSS Libraries
undicioss-projectOSS Librariesaka undici

Exploitability

Official Patch Available
No detection template yetWe can run the check for you — a free external exposure review, no install. Check my exposure

References

https://cna.openjsf.org/security-advisories.html
cna.openjsf.org
https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
github.com
https://hackerone.com/reports/3537648
hackerone.com
and 2 more references View all →

Timeline

Published
Mar 12, 2026
Last Updated
Mar 20, 2026

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