8.7

CVE-2026-59643: bouncycastle bc-java

CVSS: 8.7v4.0HighAnalyzed
AliasesUBUNTU-CVE-2026-59643DEBIAN-CVE-2026-59643
Published 03-08-2026Last modified 03-08-2026
Open JSON

Vulnerability summary

CVE-2026-59643 is a high (CVSS 8.7) vulnerability in bouncycastle bc-java. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.3% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.7/10
010
High · v4.0 (CVE.org)
EPSS score
0.24%
0%100%
Low · +0.08 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 5
OPENSUSE-SU-2026:11445-1OPENSUSE-SU-2026:21538-1SUSE-SU-2026:23127-1SUSE-SU-2026:23150-1SUSE-SU-2026:3559-1

Timeline

  1. 03-08-2026
    PublishedVulnerability first disclosed.
  2. 03-08-2026
    Last modifiedVulnerability information updated.

Description

In Bouncy Castle for Java before 1.85, OpenPGP inline-signature policy failures silently ignored. This issue also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 2.0.13.

CVSS metrics

6 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

+0.08 pp

From 0.16% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.24%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Bouncycastle2 products
Legion of the bouncy castle inc.2 products
Debian1 product
  • bouncycastleAll versions (No fix recorded) | < 1.86-1
Ubuntu1 product
  • bouncycastleAll versions (No fix recorded)

4 vendors · 6 products

References

5 links