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CVE-2026-58102                                       CPAN Security Group
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         CVE ID:  CVE-2026-58102
   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 a heap
out-of-bounds read via a long certificate extension OID in hv_exts

Description
-----------
Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow a heap
out-of-bounds read via a long certificate extension OID in hv_exts.

When building the extension hash (via extensions(),
extensions_by_long_name(), extensions_by_oid(), or
has_extension_oid()), the code passes OBJ_obj2txt()'s return value as
the hash-key length; because that value is the OID's full text length
rather than the bytes written to the fixed-size buffer (129 bytes), an
OID whose text is longer than the 129-byte buffer causes a read past
the allocation, exposing adjacent heap memory as the returned hash key.
extensions_by_name() uses the static shortname path and is not
affected.

Problem types
-------------
- CWE-125 Out-of-bounds Read

Workarounds
-----------
Callers that must enumerate extensions of untrusted certificates can
restrict enumeration to extensions_by_name(), which uses the static
shortname path and does not trigger the over-read.

Solutions
---------
Upgrade to Crypt::OpenSSL::X509 2.1.3 or later.

References
----------
https://github.com/dsully/perl-crypt-openssl-x509/commit/757289bfce095455c104d4adfe9312e7b339620f.patch
https://metacpan.org/release/JONASBN/Crypt-OpenSSL-X509-2.1.3/source/Changes.md