CVE-2026-81688 [HIGH] – openssl_encrypt versions before 1.4.9 store an unkeyed SHA-256 hash of the plaintext in th

openssl_encrypt versions before 1.4.9 store an unkeyed SHA-256 hash of the plaintext in the cleartext file header metadata. Attackers can read this hash without the password to confirm guessed plaintexts offline or fingerprint identical plaintexts across separately-encrypted files.