Bug 2447145 (CVE-2026-1528)

Summary:	CVE-2026-1528 undici: undici: Denial of Service via crafted WebSocket frame with large length
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aazores, abarbaro, alizardo, anpicker, asoldano, bbaranow, bmaxwell, bparees, brian.stansberry, cmah, darran.lofthouse, dosoudil, dschmidt, eaguilar, ebaron, erezende, fjuma, hasun, istudens, ivassile, iweiss, jchui, jfula, jhe, jkoehler, jlanda, jolong, jowilson, kshier, ktsao, lphiri, mosmerov, msvehla, nboldt, nwallace, nyancey, ometelka, pberan, pesilva, pjindal, pmackay, psrna, ptisnovs, rstancel, sdawley, simaishi, smaestri, smcdonal, stcannon, syedriko, teagle, tom.jenkinson, xdharmai, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in undici. A remote attacker could exploit this vulnerability by sending a specially crafted WebSocket frame with an extremely large 64-bit length. This causes undici's ByteParser to overflow its internal calculations, leading to an invalid state and a fatal TypeError. The primary consequence is a Denial of Service (DoS), which terminates the process.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2447157, 2447158, 2447160, 2447162
Bug Blocks:

Description OSIDB Bzimport 2026-03-12 21:02:00 UTC

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.

Comment 3 errata-xmlrpc 2026-04-08 13:54:42 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7080 https://access.redhat.com/errata/RHSA-2026:7080

Comment 4 errata-xmlrpc 2026-04-08 18:04:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:7123 https://access.redhat.com/errata/RHSA-2026:7123

Comment 5 errata-xmlrpc 2026-04-09 12:47:12 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7302 https://access.redhat.com/errata/RHSA-2026:7302

Comment 6 errata-xmlrpc 2026-04-09 13:19:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:7310 https://access.redhat.com/errata/RHSA-2026:7310

Comment 7 errata-xmlrpc 2026-04-09 20:20:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:7350 https://access.redhat.com/errata/RHSA-2026:7350

Comment 8 errata-xmlrpc 2026-04-13 02:23:06 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:7675 https://access.redhat.com/errata/RHSA-2026:7675

Comment 9 errata-xmlrpc 2026-04-13 02:47:37 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:7670 https://access.redhat.com/errata/RHSA-2026:7670

Comment 11 errata-xmlrpc 2026-04-14 06:52:08 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:7983 https://access.redhat.com/errata/RHSA-2026:7983

Comment 12 errata-xmlrpc 2026-05-26 03:53:52 UTC

This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:17789 https://access.redhat.com/errata/RHSA-2026:17789