CVE-2026-59650CWE-20

CVE-2026-59650

Critical · published August 3, 2026

CVSS v3.1
9.1
EPSS
0%
Percentile
25.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00337 · 25.8th percentile
Weakness
CWE-20 · Improper Input Validation
Published
2026-08-03T05:16Z
Affected products (2)
ProductVersionsFixed in
bouncycastle/bc-java< 1.851.85
bouncycastle/bouncy_castle_for_java_lts≤ 2.73.11—
References (2)
https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148 · 91579145-5d7b-4cc5-b925-a0262ff19630https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650 · 91579145-5d7b-4cc5-b925-a0262ff19630
EPSS history
Timeline
  • 03 AUG 00:42Z
    MTI/A0 DH agreement exponentiates unvalidated peer value
    cvelistv5