{"id":17905,"date":"2026-09-07T04:30:42","date_gmt":"2026-09-06T20:30:42","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-86219"},"modified":"2026-09-07T04:30:42","modified_gmt":"2026-09-06T20:30:42","slug":"cve-2026-86219","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-86219","title":{"rendered":"CVE-2026-86219 &#8211; Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authenticat"},"content":{"rendered":"<p>Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step.<\/p>\n<p>server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns. server_step derives the expected digest from the client&#8217;s own parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge.<\/p>\n<p>An attacker who observes one successful `qop=auth` exchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step.<\/p>\n<p>server_start generates a fresh nonce and sends it in the c<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17905","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=17905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}