Vulnerability Description
Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file, or a PKCS#8 encrypted private key that uses a PKCS#12 password-based encryption algorithm, to cause a denial of service through CPU exhaustion via an iteration count of zero or below, because the derivation loop ran until its counter equalled the count, so for such a count it wrapped through about 2^32 iterations before the MAC or the password could be checked. A 75-byte PFX file with a negative MacData iteration count kept Pkcs12Store.Load busy for many minutes.
Related Weaknesses (CWE)
References
- https://github.com/bcgit/bc-csharp/commit/0c7a6dfd64c4a479577e35a728a766721b79ab
- https://github.com/bcgit/bc-csharp/commit/7c0ed15f9783c9595b1a53f3900136461fd944
- https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63575
FAQ
What is CVE-2026-63575?
CVE-2026-63575 is a documented vulnerability. Loop with unreachable exit condition in the PKCS#12 key derivation (Pkcs12ParametersGenerator) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (P...
How severe is CVE-2026-63575?
CVSS scoring is not yet available for CVE-2026-63575. Check NVD for updates.
Is there a patch for CVE-2026-63575?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.