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openssl_encrypt versions before 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last st
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— before 1.4.6
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vxf9-vwp6-2w43
- https://www.vulncheck.com/advisories/openssl-encrypt-before-kdf-bypass-via-sequential-xor
Structured record: https://osv.dev/vulnerability/PYSEC-2026-3976
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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