Use After Free in Openssl
CVE-2026-28387
Issue summary: An uncommon configuration of clients performing DANE TLSA-based server authentication, when paired with uncommon server DANE TLSA records, may result in a use-after-free and/or double-free on the client side. Impact summary…
Vulnerability class: Use-After-Free
EPSS: 0.000 (14.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-2026-28387?
- CVE-2026-28387 is a high-severity vulnerability in Openssl, classified under Use After Free. CVSS score: 8.1/10. Published 2026-04-07.
- How severe is CVE-2026-28387?
- High severity. CVSS v3 base score is 8.1 out of 10.