Crypt::OpenSSL::PKCS12 versions before 1.98 for Perl allow a NULL pointer dereference in print_attribute via a zero length BMPSTRING attribute

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-17510
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-09 02:16:34 UTC
Updated2026-08-09 04:17:35 UTC
DescriptionCrypt::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.

Risk And Classification

Problem Types: CWE-476 | CWE-476 CWE-476 NULL Pointer Dereference

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA JONASBN CryptOpenSSLPKCS12 affected 1.98 custom Not specified

References

ReferenceSourceLinkTags
github.com/dsully/perl-crypt-openssl-pkcs12/commit/6cb282d8d8e8ded485955... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
www.openwall.com/lists/oss-security/2026/08/09/1 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/JONASBN/Crypt-OpenSSL-PKCS12-1.98/source/Changes.md 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Crypt::OpenSSL::PKCS12 1.98 or later, which sizes the buffer on the decoded string length plus one and writes an explicit terminator.

Workarounds

CNA: For deployments that cannot upgrade to 1.98, ensure that PKCS#12 files passed to info_as_hash() come from trusted sources.

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