Bug 2559870 (CVE-2026-105483)

Summary:	CVE-2026-105483 nodejs: nodejs: TLS certificate hostname bypass via fullwidth-digit IP hostnames
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aruffin, gtanzill, jbuscemi, kaycoth, rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Node.js TLS stack. Improper normalization of hostnames that use fullwidth Unicode digits to represent an IPv4 address can cause certificate hostname verification to accept a certificate that does not identify the intended peer. This may allow an attacker who can influence the connection target to impersonate a TLS server.	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:	2559951, 2559946, 2559948, 2559954
Bug Blocks:

Description OSIDB Bzimport 2026-10-23 14:10:54 UTC

A flaw was found in Node.js. A regression in TLS IP hostname normalization allows a host written with fullwidth Unicode digits to bypass certificate hostname verification in checkServerIdentity. A TLS client can be made to accept a certificate that does not properly identify the requested IP address when connecting with such a hostname, enabling server impersonation.

Comment 3 Jon Orris 2026-10-29 14:20:57 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:92376 https://access.redhat.com/errata/RHSA-2026:92376

Comment 4 Jon Orris 2026-10-29 22:29:56 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:92378 https://access.redhat.com/errata/RHSA-2026:92378