What is CVE-2026-12185?

CVE-2026-12185 is a high-severity vulnerability in Bouncycastle Bc-Java, classified under CWE-789. CVSS score: 8.6/10. Published 2026-08-03.

How severe is CVE-2026-12185?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Bouncycastle Bc-Java

CVE-2026-12185

In Bouncy Castle for Java before 1.85, BKS/UBER keystore allocates from untrusted lengths before integrity check. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

Published 2026-08-03 · last modified 2026-08-28.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (21.7th percentile), scored 2026-11-04.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Bouncycastle Bc-Java
Bouncycastle Bouncy Castle For Java Lts
Legion Of The Bouncy Castle Inc. Bc-Java — versions 0
Legion Of The Bouncy Castle Inc. Bc-Lts-Java — versions 2.73.0

Weakness classification (CWE)

CWE-789

References

91579145-5d7b-4cc5-b925-a0262ff19630 (Patch, patch)
91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory)
91579145-5d7b-4cc5-b925-a0262ff19630 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2026-12185?: CVE-2026-12185 is a high-severity vulnerability in Bouncycastle Bc-Java, classified under CWE-789. CVSS score: 8.6/10. Published 2026-08-03.
How severe is CVE-2026-12185?: High severity. CVSS v3 base score is 8.6 out of 10.