Bug 2499852 (CVE-2026-58101)

Summary:	CVE-2026-58101 perl-Crypt-OpenSSL-X509: Crypt::OpenSSL::X509: Denial of Service due to NULL pointer dereference
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	Keywords:	Security
Target Milestone:	---
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Crypt::OpenSSL::X509, a Perl module for handling X.509 certificates. A remote attacker could exploit this vulnerability by presenting a malformed X.509 certificate. This could lead to a Denial of Service (DoS) by causing the Perl process to crash due to a NULL pointer dereference during certificate extension parsing.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2512099, 2512100
Bug Blocks:

Description OSIDB Bzimport 2026-07-13 23:01:58 UTC

Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference.

X509V3_EXT_d2i(ext) returns NULL when an extension's DER value fails to parse. basicC, ia5string, and auth_att dereference its result without a NULL check. keyid_data also dereferences akid->keyid, which is NULL for an empty AKI SEQUENCE (DER 30 00) even when the parse succeeds.

A caller invoking an affected helper on an extension from an untrusted certificate triggers a SIGSEGV that crashes the Perl process.