Double free in OpenSSL - CVE-2026-35188
Published: June 10, 2026
Vulnerability identifier: #VU134273
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-35188
CWE-ID: CWE-415
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 cause a denial of service.
The vulnerability exists due to double free in the client's certificate verification path when checking a crafted OCSP stapled response delivered through the status_request extension. A remote attacker can deliver a crafted OCSP stapled response to cause a denial of service.
OCSP stapling is not enabled by default.
How to mitigate CVE-2026-35188
Install security update from vendor's website.