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Advisory record · GHSA-wg6q-6289-32hp

Bouncy Castle Crypto Package For Java: Use of a Broken or Risky Cryptographic Algorithm vulnerability in bcpkix modules

CVSS 6.3 MediumEPSS 0.0078 · 56th percentile

Published by the GitHub Advisory Database at 15 Apr 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.bouncycastle:bcpkix-jdk18onMaven>=1.49, <1.841.84
org.bouncycastle:bcpkix-jdk15to18Maven>=1.49, <1.841.84
org.bouncycastle:bcpkix-jdk15onMaven>=1.49, <1.841.84
org.bouncycastle:bcpkix-jdk14Maven>=1.49, <1.841.84
org.bouncycastle:bcpkix-debug-jdk18onMaven>=1.49, <1.841.84
org.bouncycastle:bcpkix-debug-jdk15to18Maven>=1.49, <1.841.84
org.bouncycastle:bcpkix-debug-jdk14Maven>=1.49, <1.841.84
Identifiers
GHSA-wg6q-6289-32hp · CVE-2026-5588
Weakness (CWE)
CWE-327 · CWE-347
Tags
Published
15 Apr 2026
Updated
10 Sept 2026

Machine-written summary

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

Bouncy Castle's bcpkix modules (bcpkix-jdk18on, bcpkix-jdk15to18, bcpkix-jdk15on, bcpkix-jdk14 and their debug variants) versions 1.49 through 1.83 are affected. The PKIX draft CompositeVerifier accepts an empty signature sequence as valid. Upgrade to version 1.84 or later. The source gives few details about how an attacker would exploit this.

Written 2 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
6.3 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber CNA (bcorg)
  • CISA KEV Not listed.
  • EPSS 0.0078, the 56th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.