CVE-2026-74900
openssl_encrypt before 1.4.0 Weak Shared Secret via PQC Simulation Mode
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
openssl_encrypt versions before 1.4.0 contain a critical vulnerability in pqc.py where KEM decapsulation failures silently fall back to simulation mode, generating a deterministic shared secret from only 16 bytes of the private key and publicly available encapsulated key data. Attackers who obtain 16 bytes of the private key can compute the shared secret and decrypt all ciphertext, as the fallback triggers on any KEM failure without raising an error.
| CWE | CWE-391 |
| Vendor | jahlives |
| Product | openssl_encrypt |
| Published | Aug 17, 2026 |
| Last Updated | 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