Use-after-free in OpenSSL - CVE-2026-45447
Published: June 10, 2026
Vulnerability identifier: #VU134270
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-45447
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSL Software Foundation
Affected software:
OpenSSL
OpenSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in the PKCS7_verify() function when processing a specially crafted PKCS#7 or S/MIME signed message during PKCS#7 signature verification. A remote attacker can send a specially crafted signed message to execute arbitrary code.
Applications using the CMS APIs for this processing are not affected.
How to mitigate CVE-2026-45447
Install security update from vendor's website.