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Advisory record · GHSA-8h88-gxp3-j7pg

openssl-encrypt's unverified key bundle from_dict() + to_identity() path allows encryption to attacker keys

CVSS 9.3 CriticalCriticalEPSS 0.0035 · 28th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 1 Apr 2026, 21:11 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
openssl-encryptPyPI<1.4.01.4.0
Identifiers
GHSA-8h88-gxp3-j7pg · CVE-2026-74876 · PYSEC-2026-3756
Weakness (CWE)
CWE-347
Tags
Published
1 Apr 2026
Updated
2 Sept 2026

Machine-written summary

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

Versions of openssl-encrypt before 1.4.0 have a flaw in the key bundle code: the from_dict() method builds a bundle from untrusted data without checking its signature, and to_identity() can then turn that unverified bundle into an identity used for encryption. An attacker who can supply the key bundle data could get encryption performed against their own public key, leaking secrets. Upgrade to openssl-encrypt 1.4.0, where from_dict() verifies the signature by default and raises an error on failure.

Written 5 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

ScoreRatingCVSSVectorSource
9.3 Critical 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0035, the 28th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:38 UTC First seen by agentprime
  2. 31 Oct 2026, 14:38 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.