Improper Check for Certificate Revocation Affecting netty package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published29 Jul 2026
- disclosed29 Jul 2026
Introduced: 29 Jul 2026
NewCVE-2026-56821 (opens in a new tab)How to fix?
There is no fixed version for Echo:latest netty.
NVD Description
Note: Versions mentioned in the description apply only to the upstream netty package and not the netty package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response to bypass revocation of a since-revoked certificate. Exploitation can lead to certificate revocation bypass via replay of an expired OCSP response. Any application using OcspServerCertificateValidator is affected; a revoked certificate can be accepted. This issue has been fixed in versions 4.1.136.Final and 4.2.16.Final.