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

> CVE-2026-59650: MTI/A0 DH agreement exponentiates unvalidated peer value. CVSS 9.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-59650
Last updated: 2026-08-31T18:07:14Z

- Published: 2026-08-03 00:42 UTC · Updated: 2026-08-31 18:07 UTC · Assigner: bcorg
- CVSS: 9.1 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.34%, 27th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-20

## 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.

## Affected vendors and products

- Legion of the Bouncy Castle Inc.: BC-JAVA
- Legion of the Bouncy Castle Inc.: BC-LTS-JAVA

## Tracked companies

- [Confluence](https://rewindex.com/company/confluence.md)
- [Jira](https://rewindex.com/company/jira.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-59650)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-59650)
- [https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148](https://github.com/bcgit/bc-java/commit/daeaae9d7075d04f40812e68671ebf4c777b5148)
- [https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650](https://github.com/bcgit/bc-java/wiki/CVE%E2%80%902026%E2%80%9059650)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-59650 · Markdown: https://rewindex.com/cve/CVE-2026-59650.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-59650 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:10.447Z