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CVE-2026-58101                                       CPAN Security Group
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         CVE ID:  CVE-2026-58101
   Distribution:  Crypt-OpenSSL-X509
       Versions:  before 2.1.3

       MetaCPAN:  https://metacpan.org/dist/Crypt-OpenSSL-X509
       VCS Repo:  https://github.com/dsully/perl-crypt-openssl-x509

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

Description
-----------
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.

Problem types
-------------
- CWE-476 NULL Pointer Dereference

Solutions
---------
Upgrade to Crypt::OpenSSL::X509 2.1.3 or later, which NULL-checks each
X509V3_EXT_d2i result and the optional keyid field before
dereferencing.

References
----------
https://github.com/dsully/perl-crypt-openssl-x509/commit/4c1e2370556097c253ae27abe9e1097ea377fbd2.patch
https://metacpan.org/release/JONASBN/Crypt-OpenSSL-X509-2.1.3/source/Changes.md