CVE-2026-81721
openssl_encrypt before 1.4.9 Denial of Service via KDF
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-400 |
| Vendor | jahlives |
| Product | openssl_encrypt |
| Published | Aug 27, 2026 |
| Last Updated | Aug 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
jahlives / openssl_encrypt
0 < 1.4.9