{"id":25345,"date":"2026-09-18T00:32:26","date_gmt":"2026-09-17T16:32:26","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82760"},"modified":"2026-09-18T00:32:26","modified_gmt":"2026-09-17T16:32:26","slug":"cve-2026-82760","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-82760","title":{"rendered":"CVE-2026-82760 &#8211; Inefficient Algorithmic Complexity vulnerability in team-alembic AshAuthentication allows"},"content":{"rendered":"<p>Inefficient Algorithmic Complexity vulnerability in team-alembic AshAuthentication allows an unauthenticated attacker to exhaust CPU and memory via an oversized base62 segment in a submitted API key.<\/p>\n<p>AshAuthentication.Base.decode62\/1 in lib\/ash_authentication\/base.ex splits its argument into one binary per character and folds it with charval62\/2, which recomputes Integer.pow(62, index) at every position instead of accumulating by Horner&#8217;s method, so cost grows roughly cubically in the input length. bindecode62\/1 in the same module is quadratic through Integer.undigits\/2 and Integer.digits\/2. Neither function caps byte_size\/1, and AshAuthentication.Strategy.ApiKey.SignInPreparation passes the underscore-separated segments of the submitted key straight into both, before any key lookup and without prior authentication. The surrounding rescue clauses catch exceptions, not CPU or memory exhaustion.<\/p>\n<p>This issue affects ash_authentication: from 4.8.0 before 4.15.0 and from 5.0.0-rc.0 before 5.0.0-rc.14.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Inefficient Algorithmic Complexity vulnerability in team-alembic AshAuthentication allows an unauthenticated attacker to exhaust CPU and memory via an oversized base62 segment in a submitted API key.<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25345","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25345","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=25345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25345"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}