Is CVE-2026-81688 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-81688?

CVE-2026-81688 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-81688

Description

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.