CVE-2026-58102 JONASBN CVE debrief

Who should care

Users of Crypt::OpenSSL::X509 versions before 2.1.3 for Perl should be aware of this vulnerability and take steps to mitigate it. This may include upgrading to version 2.1.3 or later, or implementing compensating controls to limit the impact of a potential exploit. Affected operator, platform, vulnerability-management, and security-team impact should be reviewed.

Technical summary

The vulnerability is caused by the use of OBJ_obj2txt()'s return value as the hash-key length, which is the OID's full text length rather than the bytes written to the fixed-size buffer (129 bytes). This causes a read past the allocation, exposing adjacent heap memory as the returned hash key. The vulnerability is exploitable via a long certificate extension OID in hv_exts. Affected product deployments should be reviewed for exposure, and owners should be assigned for follow-up.

Defensive priority

High

Recommended defensive actions

• Upgrade to Crypt::OpenSSL::X509 version 2.1.3 or later
• Implement compensating controls to limit the impact of a potential exploit
• Monitor for and respond to potential exploitation attempts
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-13T23:16:47.127Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity. The vulnerability is caused by a heap out-of-bounds read in Crypt::OpenSSL::X509 versions before 2.1.3 for Perl.

Official resources