Critical 9.3Published Aug 2, 2026

CVE-2026-59650MTI/A0 DH agreement exponentiates unvalidated peer value

Updated under an hour ago (Oct 26, 2026, 3:00 PM ET)

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It affects Legion of the Bouncy Castle Inc. BC-JAVA and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Legion of the Bouncy Castle Inc. BC-JAVA

Exploited in the last 30 days

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.

CVSS: 9.3 CRITICAL (v4.0, CNA)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/U:Amber
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: bcorg
NVD analysis: Analyzed
Record last updated: Aug 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Legion of the Bouncy Castle Inc. BC-JAVA legion_of_the_bouncy_castle:bc_java (from the name)	before 1.85	CNA record
Legion of the Bouncy Castle Inc. BC-LTS-JAVA legion_of_the_bouncy_castle:bc_lts_java (from the name)	from 2.73.0 before 2.73.12	CNA record
bouncycastle bc-java bouncycastle:bc-java	before 1.85	NVD
bouncycastle bouncy_castle_for_java_lts bouncycastle:bouncy_castle_for_java_lts	through 2.73.11	NVD

References

References

https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650	vendor-advisory, third-party-advisory
https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.