Memory leak in OpenSSL - CVE-2026-54876
Published: August 16, 2026
Vulnerability identifier: #VU143572
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54876
CWE-ID: CWE-401
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of memory after effective lifetime in OCSP response checking during X.509 certificate chain verification when processing a stapled OCSP response containing no single response entries. A remote attacker can send a malicious TLS server response to cause a denial of service.
Only client applications that explicitly enable OCSP response check verification flags are affected.
Affected software
OpenSSL
How to mitigate CVE-2026-54876
Cybersecurity Help is currently unaware of any official solution to address this vulnerability.