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.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - 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.
    (CVE-2026-58101)

  - 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. (CVE-2026-58102)

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-7b98f6d033 advisory.

    Fixes CVE-2026-58101 and CVE-2026-58102

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-df7ecb3577 advisory.

    Fixes CVE-2026-58101 and CVE-2026-58102

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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.
    (CVE-2026-58101)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
445381	Alpine: multiple perl-crypt-openssl-x509 packages: security update to 2.1.3-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	critical
445381	Alpine: multiple perl-crypt-openssl-x509 packages: security update to 2.1.3-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	critical
328926	Fedora 43 : perl-Crypt-OpenSSL-X509 (2026-7b98f6d033)	Nessus	Fedora Local Security Checks	critical
328873	Fedora 44 : perl-Crypt-OpenSSL-X509 (2026-df7ecb3577)	Nessus	Fedora Local Security Checks	critical
326751	Linux Distros Unpatched Vulnerability : CVE-2026-58101	Nessus	Misc.	high

Detections

Analytics

CVE-2026-58101

high

Tenable Plugins

critical

critical

critical

critical

high