CVE-2026-59650

critical

Description

In Bouncy Castle for Java before 1.85, MTI/A0 DH agreement exponentiates unvalidated peer value. This issue also affects Bouncy Castle for Java LTS before 2.73.12.

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650

https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148

Details

Source: Mitre, NVD

Published: 2026-08-03

Updated: 2026-08-04

Risk Information

CVSS v2

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 9.1

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Severity: Critical

CVSS v4

Base Score: 9.3

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N