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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: Aug 4, 2026 Sources: CVE List NVD GHSACWE-248
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 60.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

undici
oss-project
undiciOn-prem
OSS Libraries / npm
nodejs
oss-project·USaka node, node.js
undici
OSS Libraries
npm
package-ecosystem
undici
OSS Libraries

Exploitability

Official Patch Available
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References

https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
github.com
https://hackerone.com/reports/3537648
hackerone.com
https://cna.openjsf.org/security-advisories.html
cna.openjsf.org
and 20 more references View all →

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