{"id":82655,"date":"2026-07-29T03:46:38","date_gmt":"2026-07-29T00:16:38","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-56821-netty-out-of-date-ocsp-responses-accepted-by-ocspservercertificatevalidator\/"},"modified":"2026-07-29T03:46:38","modified_gmt":"2026-07-29T00:16:38","slug":"cve-2026-56821-netty-out-of-date-ocsp-responses-accepted-by-ocspservercertificatevalidator","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-56821-netty-out-of-date-ocsp-responses-accepted-by-ocspservercertificatevalidator\/","title":{"rendered":"CVE-2026-56821 &#8211; Netty: Out-of-date OCSP Responses Accepted by OcspServerCertificateValidator"},"content":{"rendered":"<p>CVE ID :CVE-2026-56821<\/p>\n<p>  Published : July 29, 2026, 12:16 a.m. | 23\u00a0minutes ago<\/p>\n<p>  Description :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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker replay a stale GOOD response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.<\/p>\n<p>  Severity: 7.4 | HIGH<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-56821 Published : July 29, 2026, 12:16 a.m. | 23\u00a0minutes ago Description :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 Prior to versions 4.1.136.Final and 4.2.16.Final, the OcspServerCertificateValidator flags an out-of-date OCSP response but does not stop processing it, so an expired GOOD response is still reported as VALID, letting an on-path attacker &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82655","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82655","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82655"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82655\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82655"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82655"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82655"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}