Bug 2556635 (CVE-2026-113812)

Summary:	CVE-2026-113812 perl-mozilla-ca: Mozilla::CA: TLS server impersonation via compromised intermediate certificates
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:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers, yguenane
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in Mozilla::CA. The Certificate Authority (CA) bundle includes a root certificate linked to compromised intermediate certificates. A remote attacker capable of intercepting or redirecting network traffic could exploit this flaw using the compromised keys to impersonate a Transport Layer Security (TLS) server, leading to the interception or disclosure of sensitive encrypted communications.	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:

Description OSIDB Bzimport 2026-10-20 22:10:11 UTC

Mozilla::CA versions before 20261020 for Perl provide a CA certificate bundle containing a root linked to compromised intermediates.

The bundle includes "emSign ECC Root CA - G3", which provides a trust path for intermediate certificates whose private keys are publicly available.

An attacker able to intercept or redirect client traffic may use these keys to impersonate a TLS server.

LWP, HTTP::Tiny and other clients normally use IO::Socket::SSL, which looks for CA certificates in OpenSSL's default locations before falling back to Mozilla::CA.

Configuration and environment variables can override this selection. Users should check which CA store their client uses. If it uses the system store, check for and install the operating system vendor's updates for this incident.

Comment 1 Tomas Hoger 2026-10-21 11:10:26 UTC

The perl-Mozilla-CA packages in Red Hat Enterprise Linux and Fedora have been using system CA bundle for the past 15 years:

https://src.fedoraproject.org/rpms/perl-Mozilla-CA/c/df77aa9a2659c1d3fba630fc0f7ddd92a7fd1bc4

They do not contain any certificate bundle and are therefore not affected by this issue.