NULL pointer dereference in Openssl
CVE-2026-28388
Issue summary: When a delta CRL that contains a Delta CRL Indicator extension is processed a NULL pointer dereference might happen if the required CRL Number extension is missing. Impact summary: A NULL pointer dereference can trigger a c…
EPSS: 0.000 (14.1th 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 3.6.0, 3.5.0, 3.4.0
Weakness classification (CWE)
References
- openssl-security@openssl.org (vendor-advisory, Vendor Advisory)
- openssl-security@openssl.org (Patch, patch)
- openssl-security@openssl.org (Patch, patch)
- openssl-security@openssl.org (Patch, patch)
- openssl-security@openssl.org (Patch, patch)
- openssl-security@openssl.org (Patch, patch)
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
Frequently asked questions
- What is CVE-2026-28388?
- CVE-2026-28388 is a high-severity vulnerability in Openssl, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-04-07.
- How severe is CVE-2026-28388?
- High severity. CVSS v3 base score is 7.5 out of 10.