CVE-2026-59642

High

Description

In Bouncy Castle for Java before 1.85, CMS AuthenticatedData content not bound to MAC when authAttrs present. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).

SeverityHigh

CVSS7.5

Exploit probability—

ProductBouncycastle Bcpkix-fips

PublishedAug 3, 2026

First seenAug 3, 2026

Weakness typeCWE-354CWE-354

How to fix

Update

bouncycastle bcpkix-fips1.0.12, 2.0.12, 2.1.12 or later
bouncycastle bc-java1.85 or later

Patches

github.com/bcgit/bc-java/commit/2117f316a5a47308f3e569695a6592b16aac0dd7

Vendor advisories

github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059642

Affected products

Product	Affected versions	Fixed in
bouncycastle bcpkix-fips	v < 1.0.12, 2.0.7 ≤ v < 2.0.12, 2.1.8 ≤ v < 2.1.12	1.0.12, 2.0.12, 2.1.12
bouncycastle bc-java	v < 1.85	1.85
bouncycastle bouncy_castle_for_java_lts	v ≤ 2.73.11	—

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