CVE-2026-81721 — openssl_encrypt before 1.4.9 Denial of Service via KDF
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. At…
Published: 2026-08-27 · CVSS: 8.7 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7