CVE-2026-59642CWE-354

CVE-2026-59642

High · published August 3, 2026

CVSS v3.1

7.5

EPSS

Percentile

21.9

In the wild

Unconfirmed

What it is

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).

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: 0.00303 · 21.9th percentile
Weakness: CWE-354 · Improper Validation of Integrity Check Value
Published: 2026-08-03T05:16Z

Affected products (5)

Product	Versions	Fixed in
bouncycastle/bc-java	< 1.85	1.85
bouncycastle/bcpkix-fips	< 1.0.12	1.0.12
bouncycastle/bcpkix-fips	≥ 2.0.7, < 2.0.12	2.0.12
bouncycastle/bcpkix-fips	≥ 2.1.8, < 2.1.12	2.1.12
bouncycastle/bouncy_castle_for_java_lts	≤ 2.73.11	—

References (2)

https://github.com/bcgit/bc-java/commit/2117f316a5a47308f3e569695a6592b16aac0dd7 · 91579145-5d7b-4cc5-b925-a0262ff19630 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059642 · 91579145-5d7b-4cc5-b925-a0262ff19630

EPSS history

Timeline

03 AUG 00:53Z
CMS AuthenticatedData content not bound to MAC when authAttrs present
cvelistv5