Vulnerability in Netty
CVE-2026-56820
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and prior to 4.1.135.Final, `OcspClient` does not validate that the `CertificateID` in an OCSP response…
Vulnerability class: Improper Certificate Validation
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Netty — versions >= 4.2.0.Final, < 4.2.16.Final, < 4.1.136.Final
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-56820?
- CVE-2026-56820 is a high-severity vulnerability in Netty, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-07-21.
- How severe is CVE-2026-56820?
- High severity. CVSS v3 base score is 7.4 out of 10.