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Advisory record · GHSA-vfgx-5q85-58q3

openssl-encrypt has non-cryptographic PRNG used for steganography pixel selection

CVSS 8.7 HighEPSS 0.0044 · 38th percentile

Published by the GitHub Advisory Database at 31 Mar 2026, 23:43 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-vfgx-5q85-58q3 · CVE-2026-74874 · PYSEC-2026-3754
Weakness (CWE)
CWE-330 · CWE-338
Tags
Published
31 Mar 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 use Python's non-cryptographic Mersenne Twister generator to choose which pixels or samples carry hidden data in its steganography feature, and the password is truncated to 64 bits for the seed. An attacker who knows or guesses the password, or who can observe enough generated output, can predict which pixels hold hidden data and may extract it without the password. Upgrade to openssl-encrypt 1.4.0 or later.

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
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 0.0044, the 38th percentile, on 12 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.