CVE-2026-74871
openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 17, 2026
- Updated
- Oct 1, 2026
- Reserved
- Aug 17, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 6.2 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-916 Use of Password Hash With Insufficient Computational Effort
Affected Products
| Product | Versions |
|---|---|
openssl_encryptjahlives |
|
References
- GitHub Security Advisory (GHSA-vxf9-vwp6-2w43)vendor-advisory
- VulnCheck Advisory: openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XORthird-party-advisory
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