CVE-2026-81721
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Aug 27, 2026
Vendor
unknown
Description
openssl_encrypt before 1.4.9 fails to validate KDF cost parameters in encrypted file metadata and keystore headers, allowing attackers to trigger unbounded memory allocation. Attackers can craft malicious encrypted files declaring arbitrarily large Argon2, scrypt, or balloon KDF parameters to exhaust system memory and crash the process without authentication.