CVE-2026-74889
openssl_encrypt before 1.4.0 Weak Key Derivation via HKDF
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
openssl_encrypt versions before 1.4.0 use HKDF with no salt and static info parameter in key normalization functions, reducing entropy extraction and determinism. Attackers can exploit predictable key derivation with identical inputs to weaken cryptographic security against multi-target attacks.
| CWE | CWE-326 |
| Vendor | jahlives |
| Product | openssl_encrypt |
| Published | Aug 17, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
jahlives / openssl_encrypt
0 < 1.4.0