CVE-2026-59650
bouncycastle: Bouncy Castle for Java: Cryptographic key compromise due to unvalidated Diffie-Hellman peer value
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 3, 2026
Updated · September 24, 2026
Description
A flaw was found in Bouncy Castle for Java. 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.
Statement
This is an Important vulnerability where Bouncy Castle for Java, as used in Red Hat products, fails to validate Diffie-Hellman peer values during key agreement. This flaw allows a remote attacker to compromise cryptographic keys, potentially leading to the decryption of sensitive communications or successful impersonation, due to the low attack complexity and lack of required user interaction.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-325 · Missing Cryptographic Step