October 6, 2026

CVE Watchtower

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CVE-2026-8763NVD

Vulnerability Summary

In Bouncy Castle for Java before 1.85, Name Constraints bypass via trailing dot in rfc822Name and URI. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bc-fips 1.0.2.7 (1.0.X series), 2.0.2 (2.0.X series) and 2.1.3 (2.1.X series).
Severity Level
CRITICAL(9.3)
Published Date
Aug 3, 2026
Last Modified
Oct 5, 2026
Exploitation Status
No confirmed exploitation yet
CVE Record Status
Published
EPSS Score (30-Day)
0.43%Probability
Root Weakness (CWE)
CWE-295: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v4.0 Base Metrics — Score 9.3 (CRITICAL)
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredNone
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)None
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None

Affected & Patched Versions

Affected Versions
  • Legion of the Bouncy Castle Inc. BC-JAVA < 1.85
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA >= 2.73.0 and < 2.73.12
  • Legion of the Bouncy Castle Inc. BC-FJA >= 1.0.0 and < 1.0.2.7
  • Legion of the Bouncy Castle Inc. BC-FJA >= 2.0.0 and < 2.0.2
  • Legion of the Bouncy Castle Inc. BC-FJA >= 2.1.0 and < 2.1.3
Patched Versions
  • Legion of the Bouncy Castle Inc. BC-JAVA 1.85
  • Legion of the Bouncy Castle Inc. BC-LTS-JAVA 2.73.12
  • Legion of the Bouncy Castle Inc. BC-FJA 1.0.2.7
  • Legion of the Bouncy Castle Inc. BC-FJA 2.0.2
  • Legion of the Bouncy Castle Inc. BC-FJA 2.1.3
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🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References