JONASBN Crypt::OpenSSL::X509 up to 2.1.2 Extension Parser keyid null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k1.21+

Summaryinfo

A vulnerability was found in JONASBN Crypt::OpenSSL::X509 up to 2.1.2 and classified as problematic. This impacts an unknown function of the component Extension Parser. Such manipulation of the argument keyid leads to null pointer dereference. This vulnerability is referenced as CVE-2026-58101. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in JONASBN Crypt::OpenSSL::X509 up to 2.1.2. Affected by this issue is an unknown code of the component Extension Parser. The manipulation of the argument keyid with an unknown input leads to a null pointer dereference vulnerability. Using CWE to declare the problem leads to CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. Impacted is availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-58101 since 06/29/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available.

Upgrading to version 2.1.3 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Crypt::OpenSSL::X509 2.1.3

Timelineinfo

06/29/2026 CVE reserved
07/13/2026 +14 days VulDB entry created
07/14/2026 +0 days Advisory disclosed
07/14/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-58101 (🔒)
GCVE (CVE): GCVE-0-2026-58101
GCVE (VulDB): GCVE-100-378200

Entryinfo

Created: 07/14/2026 00:42
Changes: 07/14/2026 00:42 (55)
Complete: 🔍
Cache ID: 216::103

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