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Advisory record · GHSA-v6w3-qrh8-qccc

Bouncy Castle: the native entropy source used on Intel platforms retried the CPU entropy instructions without any bound

CVSS 8.7 HighEPSS 0.0043 · 37th percentile

Published by the GitHub Advisory Database at 8 Aug 2026, 03:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.bouncycastle:bc-fipsMaven>=2.1.0, <2.1.32.1.3
Identifiers
GHSA-v6w3-qrh8-qccc · CVE-2026-8798
Weakness (CWE)
CWE-835
Tags
Published
8 Aug 2026
Updated
18 Sept 2026

Machine-written summary

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

Bouncy Castle for Java FIPS (bc-fips) versions 2.1.0 before 2.1.3 are vulnerable. A failure of the Intel CPU entropy instructions could leave a thread looping indefinitely inside a native call, and any operation drawing from that entropy source could hang, causing denial of service. The source does not describe the attacker's access requirements. Upgrade to bc-fips 2.1.3 or later.

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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber CNA (bcorg)
  • CISA KEV Not listed.
  • EPSS 0.0043, the 37th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.