GHSA-3v63-778v-3mvp: openssl-encrypt (CVE-2026-81689)

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 wit...

CVSS 8.7 HighEPSS 0.0027 · 19th percentile

Published by the GitHub Advisory Database at 27 Aug 2026, 17:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
openssl-encrypt	PyPI	<1.4.9	1.4.9

Identifiers

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

Weakness (CWE)

CWE-916

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

openssl-encrypt versions before 1.4.9 derive the remote-pepper wrap key using unsalted HKDF-SHA256 or bare SHA-256 of the password, so the same key is produced for all users and files. An attacker who can access wrapped pepper blobs can precompute a single dictionary table and guess passwords offline across the whole deployment to recover user passwords. Upgrade to version 1.4.9 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
8.7	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0027, the 19th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:10 UTC First seen by agentprime
31 Oct 2026, 14:10 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.