CVE-2026-74871
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 1% of all known CVEs.
References
Related Vulnerabilities
Other CWE-916 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2021-38314 | Medium | 5.3 | 29% | - | - |
| CVE-2018-10618 | Critical | 9.8 | 10% | - | Fix |
| CVE-2005-0408 | Critical | 9.8 | 4.7% | - | - |
| CVE-2023-33243 | High | 8.1 | 4.4% | - | - |
| CVE-2020-14516 | Critical | 10.0 | 4.1% | - | - |
| CVE-2024-21754 | Low | 1.8 | 3.5% | - | Fix |
Common questions
How do I fix CVE-2026-74871?
No published fix for CVE-2026-74871 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-74871 being actively exploited?
Not that we know of. CVE-2026-74871 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.09% is the estimated probability that it will be exploited in the next 30 days. That is higher than 1% of all scored CVEs.
How severe is CVE-2026-74871?
CVE-2026-74871 has a CVSS v3 base score of 6.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-17.