Bug 2559873 (CVE-2026-106069)

Summary:	CVE-2026-106069 nodejs: nodejs: TLS certificate hostname bypass via non-canonical 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:	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. When a non-canonical numeric hostname is used, hostname normalization for certificate verification can disagree with how the platform resolves the address used for the connection. This can cause checkServerIdentity to accept a certificate that does not identify the peer that was actually connected, allowing server impersonation.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2559943, 2559945, 2559953, 2559956, 2559947, 2559950, 2559958
Bug Blocks:

Description OSIDB Bzimport 2026-10-23 14:11:09 UTC

A flaw was found in Node.js. Non-canonical numeric hostnames (for example 127.1 or 0127.0.0.1) can be normalized by domainToASCII() to one IPv4 address for certificate checks while the platform resolver connects to a different address. A TLS client may therefore accept a certificate that does not identify the connected peer, enabling server impersonation.

Comment 3 Jon Orris 2026-10-29 14:20:59 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 22:29:54 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