CVE-2026-81688

opensslencrypt 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...

CVE-2026-81688

openssl_encrypt versions before 1.4.9 store an unkeyed SHA-256 hash of the plaintext in the cleartext file header metadata. Because the hash is not keyed, an attacker who obtains an encrypted file can read the hash without the password and use it as a plaintext confirmation oracle — verifying gue...

CVE-2026-81688 openssl_encrypt before 1.4.9 Plaintext Confirmation Oracle via SHA-256

opensslencrypt 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...