CVE-2026-59641

What it is

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).

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data tampering.

Exploit odds

0.2% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-08-03 01:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-08-28 18:09 UTC Last updatedMost recent change to the record

Details

Published

2026-08-03 01:16 UTC

Last modified

2026-08-28 18:09 UTC

Exploit probability

0.2% · EPSS, next 30 days

Weakness

CWE-345

Record status

Analyzed

Affected

• Bouncycastle bc-java < 1.85
• Bouncycastle bcjmail-fips < 1.0.7
• Bouncycastle bcjmail-fips < 2.0.7
• Bouncycastle bcjmail-fips < 2.1.7
• Bouncycastle bcmail-fips < 1.0.7
• Bouncycastle bcmail-fips < 2.0.7
• Bouncycastle bcmail-fips < 2.1.7
• Bouncycastle Bouncy Castle For Java Lts ≤ 2.73.11

Attack profile CVSS 4.0 · 8.7

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

High

Availability

None