CVE-2026-81689

PYSEC-2026-3959 · CVE-2026-81689 · GHSA-3v63-778v-3mvp

Published Aug 27, 2026 · Modified Sep 10, 2026

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Description

openssl_encrypt versions before 1.4.9 derive the remote-pepper wrap key using unsalted HKDF-SHA256 or bare SHA-256 of the password, allowing identical keys across all users and files. Attackers with access to wrapped pepper blobs can precompute a single dictionary table and perform fleet-wide offline password guessing at hardware speed to recover user passwords.

References

ADVISORY https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-3v63-778v-3mvp
ADVISORY https://www.vulncheck.com/advisories/openssl-encrypt-before-1.4.9-weak-pepper-key-derivation

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CVE-2026-81689

Description

References

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