Threats Tagged 'cve-2026-63578'

A vulnerability in Legion of the Bouncy Castle Inc. bc-csharp before version 2.7.0 allows an attacker to cause a denial of service via CPU exhaustion. This occurs during password-based private-key decryption when an attacker supplies an encrypted private key with an iteration count close to 2^31, which is taken from unauthenticated algorithm parameters without an upper bound. The affected algorithms include PKCS#5 PBES1 and PBES2 (PBKDF2), PKCS#12 PBE algorithms, and CMS password recipients. This flaw enables resource exhaustion before password or data verification.

Allocation of resources without limits in password-based private-key decryption (PbeUtilities.GenerateCipherParameters) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply an encrypted private key, such as a PKCS#8 EncryptedPrivateKeyInfo or "ENCRYPTED PRIVATE KEY" PEM file, to cause a denial of service through CPU exhaustion via an iteration count close to 2^31, because the count is taken from the unauthenticated algorithm parameters without an upper bound and the key derivation runs before the password or the data can be checked. PKCS#5 PBES1 and PBES2 (PBKDF2), the PKCS#12 PBE algorithms and CMS password recipients (CmsPbeKey) are affected. Loading PKCS#12 files with Pkcs12Store is covered by CVE-2026-63572, and a zero or negative count with the PKCS#12 algorithms by CVE-2026-63575.