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

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 CRITICALEPSS 0.33%Not in KEVNVD: Analyzed

Last updated: 2026-08-31 18:07 UTC

OverviewCVSS details

9.3CRITICALCVSS 4.0

Score source: bcorg (CNA)
NVD status: Analyzed
Published: Aug 3, 2026
Assigner: bcorg

Affected

BC-JAVA (Legion of the Bouncy Castle Inc.)

Versions: before 1.85
Fixed in: 1.85

+1 more product →

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable yes · Impact total

EPSS · FIRST, scored Nov 9

0.33%chance of exploitation in 30 days

Higher than 27.26% of CVEs

CVSS 4.0 · bcorg (CNA)

9.3Critical

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

Attack vector: Network
Attack complexity: Low
Attack requirements: None
Privileges required: None
User interaction: None
Confidentiality impact: High
Integrity impact: High
Availability impact: None
Confidentiality (other systems): None
Integrity (other systems): None
Availability (other systems): None

CVSS 3.1 · NVD

9.1Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

NVD status: Analyzed

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.3	CRITICAL	4.0bcorg (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
9.1	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CVE ID: CVE-2026-59650
Status: Analyzed
Assigner (CNA): bcorg
Published: Aug 3, 2026
Last modified: 2026-08-31 18:07 UTC
Weaknesses: CWE-20 · Improper Input Validation

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-10 14:23 UTC.