GHSA-vxf9-vwp6-2w43: openssl-encrypt (CVE-2026-74871)

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 ...

CVSS 6.9 MediumEPSS 0.0011 · 1st percentile

Published by the GitHub Advisory Database at 17 Aug 2026, 11:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
openssl-encrypt	PyPI	<1.4.6	1.4.6

Identifiers

GHSA-vxf9-vwp6-2w43 · CVE-2026-74871 · PYSEC-2026-3976

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 1.4.6 have a key derivation flaw in sequential XOR composition mode, where the last stage cancels out during key generation. When only a single KDF is configured with no prior hashing stage, an attacker who obtains encrypted data can perform offline password guessing at SHA-256 speed rather than the configured KDF cost. Upgrade to openssl-encrypt 1.4.6 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
6.9	Medium	4.0	CVSS:4.0/AV:L/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 0.0011, the 1st percentile, on 10 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.