EUVD-2026-54850
GHSA-h64x-hp84-8636
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network vector and no required privileges reflect services accepting untrusted PKCS12 input; impact is availability only with no confidentiality or integrity compromise.
Primary rating from Vendor (CPANSec).
CVSS VectorVendor: CPANSec
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
5DescriptionCVE.org
Crypt::OpenSSL::PKCS12 versions before 1.98 for Perl allow a NULL pointer dereference in print_attribute via a zero length BMPSTRING attribute.
print_attribute() sizes the destination buffer for a BMPSTRING attribute from its declared byte length with Renew(*attribute, length, char). A zero length attribute makes that a zero size reallocation, which Perl implements as a free returning NULL, so the buffer pointer becomes NULL, the following strncpy copies nothing, and the caller dereferences NULL in the strlen() it passes to newSVpvn(). A zero length BMPSTRING is even length, so the ASN.1 decoder accepts it and the value reaches this code. The UTF8STRING, OCTET STRING and BIT STRING arms size on length + 1 or length * 4 + 1 and are unaffected.
Any caller that passes an untrusted PKCS#12 file to info_as_hash() can crash the process. info() prints attribute values directly without sizing a buffer and is unaffected.
AnalysisAI
NULL pointer dereference in Crypt::OpenSSL::PKCS12 before version 1.98 for Perl enables process crashes when any caller invokes info_as_hash() on a crafted PKCS#12 file containing a zero-length BMPSTRING bag attribute. The root cause is a zero-size Renew() call that Perl's memory allocator implements as a free() returning NULL, which is subsequently dereferenced inside strlen() within a call to newSVpvn(). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application calls info_as_hash() on attacker-controlled PKCS#12 data - the info() method is explicitly unaffected because it routes attribute values through BIO_printf rather than through the buffer-sizing code. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (High) with vector AV:N/AC:L/PR:N/UI:N reflects a network-exploitable denial-of-service requiring no authentication, which is accurate for services that accept PKCS#12 files from untrusted remote actors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker crafts a PKCS#12 file containing a bag attribute with a zero-length ASN.1 BMPSTRING value - a structurally valid construct that OpenSSL's ASN.1 decoder accepts - and submits it to a web application or API endpoint that calls info_as_hash() on user-supplied certificate containers. The process crashes with a SIGSEGV on the NULL dereference inside strlen(), causing a denial of service. … |
| Remediation | Upgrade Crypt::OpenSSL::PKCS12 to version 1.98 or later using cpanm Crypt::OpenSSL::PKCS12; the changelog is available at https://metacpan.org/release/JONASBN/Crypt-OpenSSL-PKCS12-1.98/source/Changes.md and the patch commit is independently verifiable at https://github.com/dsully/perl-crypt-openssl-pkcs12/commit/6cb282d8d8e8ded4859551cd2d3cfa7c6028ce48.patch. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all services and applications using Crypt::OpenSSL::PKCS12 and document deployed versions. …
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Null Pointer Dereference
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External POC / Exploit Code
Leaving vuln.today