{"id":36976,"date":"2026-10-14T00:32:31","date_gmt":"2026-10-13T16:32:31","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-49265"},"modified":"2026-10-14T00:32:31","modified_gmt":"2026-10-13T16:32:31","slug":"cve-2026-49265","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-49265","title":{"rendered":"CVE-2026-49265 [MEDIUM] &#8211; OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0"},"content":{"rendered":"<p>OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0.0 until 4.0.0, OAuthLib&#8217;s PKCE checks in oauthlib\/oauth2\/rfc6749\/grant_types\/authorization_code.py compare attacker-supplied code_verifier values with stored challenges using ordinary string equality in code_challenge_method_plain and code_challenge_method_s256. Because the comparison can return after a length difference or the first mismatching character, repeated token endpoint measurements can reveal common-prefix timing information that could potentially allow recovery of the code_verifier, unauthorized access-token acquisition, and account takeover. Practical exploitation requires an intercepted, single-use authorization code and enough measurements to overcome real-world network noise; the local timing benchmark does not establish practical remote account takeover, so the weakness remains a defense-in-depth concern. This issue is fixed in version 4.0.0.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>OAuthLib is an implementation of the OAuth request-signing logic for Python 3.6+. From 3.0.0 until 4.0.0, OAuthLib&#8217;s PKCE checks in oauthlib\/oauth2\/rfc6749\/grant_types\/authorization_code.py compare at<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-36976","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/36976","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=36976"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=36976"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=36976"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}