CVE-2026-63572: Legion Of The Bouncy Castle Inc Bc-Csharp

High severity, CVSS 7.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Allocation of resources without limits in PKCS#12 keystore loading (Pkcs12Store.Load) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file to cause a denial of service through CPU exhaustion via an iteration count close to 2^31 in the file's MacData or in the PBE parameters of an encrypted SafeContents or shrouded key bag, because the counts are taken from the file without an upper bound and the key derivation runs before the MAC or the password can be checked. A zero or negative count is covered by CVE-2026-63575. Pkcs12Utilities.ConvertToDefiniteLength is also affected.

Affected products

• Legion Of The Bouncy Castle Inc Bc-Csharp: before 2.7.0 (fixed in 2.7.0)

Published 2026-10-02. Last modified 2026-10-02.