Out-of-bounds write in Bouncy Castle for Java FIPS - CVE-2025-9340

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Main Vulnerability Database Vulnerabilities #VU132269

Out-of-bounds write in Bouncy Castle for Java FIPS - CVE-2025-9340

Published: May 25, 2026


Vulnerability identifier: #VU132269
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2025-9340
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Legion of the Bouncy Castle Inc.
Affected software:
Bouncy Castle for Java FIPS

Detailed vulnerability description

The vulnerability allows a remote attacker to corrupt memory.

The vulnerability exists due to out-of-bounds write in BaseCipher when processing input. A remote attacker can send specially crafted input to corrupt memory.


How to mitigate CVE-2025-9340

Install security update from vendor's website.

Sources