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Advisory record · GHSA-g6rx-6wfx-gj74

Bouncy Castle for Java has Out-of-Bounds Write Vulnerability

CVSS 0.0 NoneEPSS 0.0019 · 9th percentile

Published by the GitHub Advisory Database at 22 Aug 2025, 12:30 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, <2.1.12.1.1
Identifiers
GHSA-g6rx-6wfx-gj74 · CVE-2025-9340
Weakness (CWE)
CWE-787
Tags
Published
22 Aug 2025
Updated
22 Aug 2025

Machine-written summary

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

Bouncy Castle for Java bc-fips versions 2.1.0 up to but not including 2.1.1 contain an out-of-bounds write vulnerability in the BaseCipher component. The source gives few details about how an attacker would reach or trigger it. Upgrade bc-fips to version 2.1.1.

Written 7 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
0.0 None 4.0 CVSS:4.0/AV:P/AC:L/AT:P/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N/S:N/R:U/RE:M/U:Green CNA (bcorg)
  • CISA KEV Not listed.
  • EPSS 0.0019, the 9th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:10 UTC First seen by agentprime
  2. 31 Oct 2026, 15:10 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.