CVE•Published 2026-08-03•Modified 2026-09-02•1 article on news•5 live references•NVD data

CVE-2026-8763Bouncycastle · Bc-java

Vulnerability data via NVD (ingested)

CVSS v3.1

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS percentile

Exploit Prediction Scoring System · top 72% of all CVEs

Weaknesses (CWE)

CWE-295Improper Certificate Validation

Description

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).

Timeline

Published 2026-08-03

Modified 2026-09-02

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-8763

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Bouncycastle Bc-java"

All exposed Bouncycastle Bc-java instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Bc-java"

HTTP body or banner mentions "Bc-java" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-8763