CVE-2026-59651

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductBouncycastle Bouncy Castle For Java Lts

PublishedAug 3, 2026

First seenAug 3, 2026

Weakness typeCWE-326CWE-326

How to fix

Update

bouncycastle bc-java1.85 or later

Patches

github.com/bcgit/bc-java/commit/faf5daa6e9b8460f862afc0af1cc0da365f7d4d2

Vendor advisories

github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059651

Affected products

Product	Affected versions	Fixed in
bouncycastle bouncy_castle_for_java_lts	v ≤ 2.73.11	—
bouncycastle bc-java	v < 1.85	1.85

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