CVE-2026-59651CWE-326

CVE-2026-59651

High · published August 3, 2026

CVSS v3.1

7.5

EPSS

Percentile

8.8

In the wild

Unconfirmed

What it is

In Bouncy Castle for Java before 1.85, BKS keystore accepts legacy version with 16-bit integrity MAC key. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

The record

Technical detail

CVSS v3.1: 7.5 · HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CVSS v4.0: Not supplied
EPSS: 0.00196 · 8.8th percentile
Weakness: CWE-326 · Inadequate Encryption Strength
Published: 2026-08-03T05:16Z

Affected products (2)

Product	Versions	Fixed in
bouncycastle/bc-java	< 1.85	1.85
bouncycastle/bouncy_castle_for_java_lts	≤ 2.73.11	—

References (2)

https://github.com/bcgit/bc-java/commit/faf5daa6e9b8460f862afc0af1cc0da365f7d4d2 · 91579145-5d7b-4cc5-b925-a0262ff19630 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059651 · 91579145-5d7b-4cc5-b925-a0262ff19630

EPSS history

Timeline

03 AUG 00:41Z
BKS keystore accepts legacy version with 16-bit integrity MAC key
cvelistv5