{"id":11564,"date":"2026-09-04T18:53:42","date_gmt":"2026-09-04T10:53:42","guid":{"rendered":"https:\/\/www.54iter.cn\/?vuln=cve-2026-75803"},"modified":"2026-09-04T18:53:42","modified_gmt":"2026-09-04T10:53:42","slug":"cve-2026-75803","status":"publish","type":"vuln","link":"https:\/\/www.54iter.cn\/?vuln=cve-2026-75803","title":{"rendered":"CVE-2026-75803 [CRITICAL] &#8211; Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty\nciphertext can repor"},"content":{"rendered":"<p>Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty<br \/>\nciphertext can report success without verifying the supplied authentication<br \/>\ntag when the operation is finalized by calling the EVP_Cipher() function.<\/p>\n<p>Impact summary: Applications calling EVP_Cipher() on an empty ciphertext and<br \/>\nexpecting the call to check the AEAD tag may accept forged messages.<\/p>\n<p>CWE: CWE-354 (Improper Validation of Integrity Check Value)<\/p>\n<p>Description: The EVP_Cipher() API call for AEAD ciphers behaves like a one<br \/>\nshot encryption and decryption call. It also verifies the AEAD tag after the<br \/>\ndecryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers<br \/>\nit skipped the AEAD tag verification when an empty ciphertext was passed to<br \/>\nthe function. The callers of this function might believe that a successful<br \/>\nreturn indicates a valid AEAD tag for these ciphers, even when that has not<br \/>\ntruly been validated in this case.<\/p>\n<p>FIPS impact: no<br \/>\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE<br \/>\nas the affected algorithms are not FIPS approved and thus not implemented<br \/>\nin the FIPS module.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty<br \/>\nciphertext can report success without verifying the supplied authentication<br \/>\ntag when the operation is finalized by calling the EVP<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-11564","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/11564","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=11564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11564"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}