NULL pointer dereference in Openssl
CVE-2026-42765
Issue summary: When a partial-chain certificate verification is enabled together with OCSP response checking for the whole chain, a NULL dereference will happen if the verified chain does not have a self-signed trusted anchor, crashing the…
EPSS: 0.005 (40.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Openssl — versions 4.0.0, 3.6.0
Weakness classification (CWE)
References
- openssl-security@openssl.org
- openssl-security@openssl.org
- openssl-security@openssl.org (vendor-advisory, Vendor Advisory)
- openssl-security@openssl.org (Patch, patch)
- openssl-security@openssl.org (Patch, patch)
Frequently asked questions
- What is CVE-2026-42765?
- CVE-2026-42765 is a high-severity vulnerability in Openssl, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-06-09.
- How severe is CVE-2026-42765?
- High severity. CVSS v3 base score is 7.5 out of 10.