CVE-2026-58102 Memory corruption in Crypt::OpenSSL::X509
A heap out-of-bounds read in the Perl Crypt::OpenSSL::X509 library allows attackers to expose adjacent heap memory via crafted certificate extension OIDs.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-58102?
CVE-2026-58102 is a critical memory corruption 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 a heap out-of-bounds read via a long certificate extension OID in hv_exts.
When building the extension hash (via extensions(), extensions_by_long_name(), extensions_by_oid(), or has_extension_oid()), the code passes OBJ_obj2txt()'s return value as the hash-key length; because that value is the OID's full text length rather than the bytes written to the fixed-size buffer (129 bytes), an OID whose text is longer than the 129-byte buffer causes a read past the allocation, exposing adjacent heap memory as the returned hash key. extensions_by_name() uses the static shortname path and is not affected.
Weakness: CWE-125
Which versions are affected by CVE-2026-58102?
It affects 1 product.
Products include Jonasbn Crypt\.
How do I fix CVE-2026-58102?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-58102 being exploited?
There is no known exploitation of CVE-2026-58102 in the wild and no public exploit code.
Other vulnerabilities in JONASBN Crypt::OpenSSL::X509
Sources
Also known as DEBIAN-CVE-2026-58102, GHSA-crh7-2j46-hqrj, UBUNTU-CVE-2026-58102.