{"schemaVersion":3,"id":"CVE-2026-75803","aliases":["ALPINE-CVE-2026-75803","RHSA-2026:59260","RHSA-2026:62786","UBUNTU-CVE-2026-75803","USN-8678-3","DEBIAN-CVE-2026-75803","CGA-28qf-m2wv-grrp","CGA-2vjx-xj42-v765","CGA-6qff-vxxh-4q42","CGA-8rcf-cvwp-q6mq","CGA-99qj-wfjx-w3q4","CGA-c5gw-wwjj-5j9f","CGA-f5p8-cmqx-6x43","CGA-g24p-w54c-2pqv","CGA-gc97-57vr-24gg","CGA-h2fr-pxg5-4xm8","CGA-mwvv-9qqf-6mxv","CGA-p6qv-wmhm-6fgm","CGA-q22j-5353-pxvh","CGA-r63w-78jg-qjwf"],"status":"published","duplicateOf":null,"title":null,"description":"Issue summary: ChaCha20-Poly1305 and AES-OCB decryption with an empty\nciphertext can report success without verifying the supplied authentication\ntag when the operation is finalized by calling the EVP_Cipher() function.\n\nImpact summary: Applications calling EVP_Cipher() on an empty ciphertext and\nexpecting the call to check the AEAD tag may accept forged messages.\n\nCWE: CWE-354 (Improper Validation of Integrity Check Value)\n\nDescription: The EVP_Cipher() API call for AEAD ciphers behaves like a one\nshot encryption and decryption call. It also verifies the AEAD tag after the\ndecryption operation. However for AES-OCB and ChaCha20-Poly1305 ciphers\nit skipped the AEAD tag verification when an empty ciphertext was passed to\nthe function. The callers of this function might believe that a successful\nreturn indicates a valid AEAD tag for these ciphers, even when that has not\ntruly been validated in this case.\n\nFIPS impact: no\nThe FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this CVE\nas the affected algorithms are not FIPS approved and thus not implemented\nin the FIPS module.","dates":{"published":"2026-08-25T13:00:25.067Z","modified":"2026-09-01T18:23:06.793Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.1,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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