CVE-2026-81718
openssl_encrypt versions before 1.4.9 use under-parameterized PBKDF2-HMAC-SHA256 with only 100,000 iterations to protect PQC keyfile private keys and 10,000 iterations for dual-encryption file-password verification. Attackers who obtain keyfiles or encrypted files can brute-force wrapping passwords offline using GPU or ASIC acceleration.
- Published Aug 27, 2026
- CVSS 8.7 high
- 0.2% chance of exploitation in the next 30 days (EPSS)
- A fix is available