Login Request a demo
High severity · published Mar 12, 2026
CVE-2026-1528
undici is vulnerable to Malicious WebSocket 64-bit length overflows undici parser and crashes the client
7.5
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UN
undici · undici
>= 6.0.0 < 6.24.0; 7.0.0 < 7.24.0 · source: vendor, NVD
CO
Cluster Observability Operator 1.5.0 · Red Hat
All versions, or not specified · source: CISA
C4
Cryostat 4 on RHEL 9 · Red Hat
All versions, or not specified · source: CISA
OL
OpenShift Lightspeed · Red Hat
All versions, or not specified · source: CISA
OP
OpenShift Pipelines · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub 1.8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Developer Hub 1.9 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 10.0 Extended Update Support · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 8 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 9 · Red Hat
All versions, or not specified · source: CISA
Affected product
UN
undici
undici
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-1528
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-1528
Vendor Advisory
https://cna.openjsf.org/security-advisories.html
Vendor Advisory
https://github.com/nodejs/undici/security/advisories/GHSA-f269-vfmq-vjvj
Permissions Required
https://hackerone.com/reports/3537648
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:13826
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:17789
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:21772
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