CVE-2026-5447CWE-122

Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier

Medium · published April 9, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
12.1
In the wild
Unconfirmed
What it is

Heap buffer overflow in CertFromX509 via AuthorityKeyIdentifier size confusion. A heap buffer overflow occurs when converting an X.509 certificate internally due to incorrect size handling of the AuthorityKeyIdentifier extension.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00222 · 12.1th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-04-09T20:13Z
EPSS history
Timeline
  • 09 APR 20:13Z
    Heap buffer overflow in CertFromX509() via AuthorityKeyIdentifier
    cvelistv5