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CVE-2026-81689

openssl_encrypt before 1.4.9 Weak Pepper Key Derivation

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-81689

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-81689

Published

openssl_encrypt

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "jahlives",
                    "product": "openssl_encrypt",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/openssl-encrypt",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "1.4.9"
                        },
                        {
                            "version": "1.4.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON