CVE-2026-58101 Crypt::OpenSSL::X509 versions before 2.1.3 for Perl allow denial of service via NULL pointer dereference
An attacker can crash the Perl process by providing a malformed certificate to the Crypt::OpenSSL::X509 library, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58101?
CVE-2026-58101 is a high-severity vulnerability in JONASBN Crypt::OpenSSL::X509, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-58101?
It affects 1 product.
Products include Jonasbn Crypt\.
How do I fix CVE-2026-58101?
Upgrade to a fixed version.
Is CVE-2026-58101 being exploited?
There is no known exploitation of CVE-2026-58101 in the wild and no public exploit code.
Other vulnerabilities in JONASBN Crypt::OpenSSL::X509
Sources
Also known as DEBIAN-CVE-2026-58101, GHSA-8wqq-45fp-2xmp, UBUNTU-CVE-2026-58101.