{"id":"CVE-2026-63570","published":"2026-10-02T08:17:01.833","lastModified":"2026-10-02T20:17:02.880","description":"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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":["CWE-835"],"vendors":[],"products":[],"references":[{"url":"https://github.com/bcgit/bc-csharp/commit/1b8fad04df4953230c9951c57678ee45c8aead85","tags":[]},{"url":"https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63570","tags":[]}],"exploitRefs":[{"url":"https://github.com/bcgit/bc-csharp/commit/1b8fad04df4953230c9951c57678ee45c8aead85","tags":[]},{"url":"https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63570","tags":[]}],"hasPoc":true,"ai":null}