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High 7.5Published Mar 12, 2026

CVE-2026-1528undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client

Updated under an hour ago ()

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It affects undici and 14 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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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.

CVSS
7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE)
CWE-248, CWE-1284
Known exploited
Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days)
Not loaded for this CVE
Assigned by
openjs
NVD analysis
Modified
Record last updated
Sep 14, 2026
First seen by InfoSec Signals
Oct 9, 2026

Affected products

Affected products
undici undici
undici:undici (from the name)
from 6.0.0 < 6.24.0; 7.0.0 < 7.24.0; 6.24.0: 7.24.0 not affected
CNA record
from 4.2.0-9 not affected
CISA ADP
from 1:22.22.2-1.el10_1 not affected
CISA ADP
from 1:22.22.2-2.el10_0 not affected
CISA ADP
from 9060020260409121057.rhel9 not affected
CISA ADP
Red Hat Cluster Observability Operator 1.5.0
redhat:cluster_observability_operator
from 1782839279 not affected
CISA ADP
from 1776784286 not affected
CISA ADP
from 1774282136 not affected
CISA ADP
from 1779814592 not affected
CISA ADP
Red Hat Red Hat OpenShift Pipelines 1.2
redhat:openshift_pipelines
from 1779910201 not affected
CISA ADP

References

References

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.

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