Threats Tagged 'cve-2026-63570'

A vulnerability in Legion of the Bouncy Castle Inc. bc-csharp before version 2.7.0 causes a denial of service due to a loop with an unreachable exit condition in the Pkcs12Store.GetCertificateChain method. This occurs when processing crafted PKCS#12 files containing certificates whose issuer links form a cycle, leading to infinite looping and resource exhaustion until an OutOfMemoryException is thrown.

Loop with unreachable exit condition in Pkcs12Store.GetCertificateChain in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a crafted PKCS#12 file to an application that loads it and requests a key entry's certificate chain to cause a denial of service, in which the call never returns and consumes CPU and memory until an OutOfMemoryException, via certificates whose issuer links form a cycle, for example two certificates whose AuthorityKeyIdentifier extensions each identify the other's public key. This happens because the chain-building loop stops only when no issuer is found or a certificate links to itself, and keeps no record of certificates already visited. The key-identifier links are followed without checking signatures.