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Advisory record · GHSA-9pwp-9qqc-pr26

Bouncy Castle: Name Constraints bypass via trailing dot in rfc822Name and URI

CVSS 9.3 CriticalCriticalEPSS 0.0043 · 37th percentile

Critical, because:

  • CVSS score 9.3: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 3 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<1.0.2.7 || >=2.0.0, <2.0.2 || >=2.1.0, <2.1.31.0.2.7, 2.0.2, 2.1.3
org.bouncycastle:bcprov-jdk18onMaven<1.851.85
org.bouncycastle:bcprov-lts8onMaven<2.73.122.73.12
org.bouncycastle:bcprov-jdk15to18Maven<1.851.85
Identifiers
GHSA-9pwp-9qqc-pr26 · CVE-2026-8763
Weakness (CWE)
CWE-295
Tags
Published
3 Aug 2026
Updated
18 Sept 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:N/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.