High [CVE-2026-59650] Bouncy Castle for Java: Cryptographic key compromise due to unvalidated Diffie-Hellman peer value
This high-severity Red Hat Linux advisory covers CVE-2026-59650.
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Summary
In Bouncy Castle for Java before 1.85, MTI/A0 DH agreement exponentiates unvalidated peer value. The software fails to validate Diffie-Hellman peer values during key agreement.
A remote attacker can exploit this flaw to compromise cryptographic keys, potentially leading to the decryption of sensitive communications or successful impersonation. Red Hat severity: Important — CVSS 7.4 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N).
Weakness: CWE-325. Red Hat lists Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat JBoss Enterprise Application Platform 7; Red Hat Single Sign-On 7 as not affected.
- < 1.85
- < 2.73.12
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 23 days ago·verify at source
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