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CVE-2026-34182 is an integrity-check validation vulnerability in OpenSSL CMS AuthEnvelopedData processing. Insufficient validation of cipher selection and authentication-tag length allows messages to specify a non-AEAD cipher or an AEAD tag truncated to one byte. An attacker can modify a captured AES-GCM message to use AES-256-OFB while preserving its recipient information, causing the recipient to unwrap the genuine content-encryption key and decrypt attacker-selected ciphertext without checking the MAC. CMS_decrypt() can consequently report success for unauthenticated content. Applications exposing decryption success or failure may additionally enable an oracle that provides content-encryption-key-equivalent functionality. One-byte authentication tags permit brute-force integrity bypass. OpenSSL FIPS modules are not affected.
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OpenSSL accepts non-AEAD ciphers and excessively short authentication tags in CMS AuthEnvelopedData. An attacker with a captured legitimate message and suitable decryption feedback may obtain content-encryption-key-equivalent functionality. Reducing an AEAD tag to one byte also permits brute-force integrity bypass. FIPS modules are unaffected.
Identified as related to CVE-2026-57062; the content provides no separate technical details, affected versions, exploitation status, or remediation information for this vulnerability.
Mentioned as related to CVE-2026-57062. The content does not describe this vulnerability independently or provide its affected products, exploitation status, or remediation.
Insufficient validation in OpenSSL CMS AuthEnvelopedData permits non-AEAD cipher substitution and excessively short authentication tags. An attacker may obtain content-encryption-key-equivalent functionality through a decryption oracle or bypass message integrity checks. FIPS modules are unaffected.
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