PT-2026-67234 · Legion Of The Bouncy Castle · Bc-Fja+2

CVE-2026-59641 · Published 2026-08-03 · Updated 2026-08-03

Mitre

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber

In Bouncy Castle for Java before 1.85, S/MIME validator trusts signer-asserted signingTime for path validation. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcmail-fips and bcjmail-fips 1.0.7 (1.0.X series), 2.0.7 (2.0.X series) and 2.1.7 (2.1.X series).

Exploit

Fix

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

CVE-2026-59641

Affected Products

Bc-Fja

Bc-Java

Bc-Lts-Java

References · 4

• 🔥 https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059641 · Exploit
• https://github.com/bcgit/bc-java/commit/2f81b22d559b3a1b026388e1ca78dd547384def8 · Patch
• https://github.com/bcgit/bc-java/commit/fd89fe918b37fea1c71e95fae50284a325b09721 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-59641 · Security Note