Vulnerability DatabaseCVE-2026-74871
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CVE-2026-74871
Published:August 17, 2026
Updated:August 29, 2026
openssl_encrypt versions before 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password cracking at SHA-256 speed instead of the configured KDF cost.
Affected Packages
openssl-encrypt (PYTHON):
Affected version(s) >=0.2.2 <1.4.6
Fix Suggestion:
Update to version 1.4.6
Related Resources (4)
https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor
https://nvd.nist.gov/vuln/detail/CVE-2026-74871
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74871.json
https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43
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CVSS v4
Base Score:
6.9
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.2
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Use of Password Hash With Insufficient Computational Effort
CWE-916
EPSS
Base Score:
0.09