Vulnerability in Netty

CVE-2026-56821

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GO…

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, >=4.2.0.Final, < 4.2.16.Final, < 4.1.136.Final

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-56821?
CVE-2026-56821 is a high-severity vulnerability in Netty, classified under Improper Check for Certificate Revocation. CVSS score: 7.4/10. Published 2026-07-29.
How severe is CVE-2026-56821?
High severity. CVSS v3 base score is 7.4 out of 10.