CVE-2026-59650

critical · 9.3

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.

9.3

CVSS

0.3%

EPSS (exploit prob.)

19th

EPSS percentile

2026-08-03

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber

Weaknesses

CWE-20

Affected products

Vendor	Product	Affected versions
bouncycastle	bc-java	< 1.85
bouncycastle	bouncy_castle_for_java_lts	<= 2.73.11

Check a specific version with /api/v1/cve/match.

References

https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148
https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-59650