CVE-2025-0343

Summary

CVE-2025-0343 is a vulnerability affecting Swift ASN.1, a library used for parsing ASN.1 data. The library experiences crashes when processing certain BER/DER constructions due to a misassumption about the constraints of objects in DER format. The Swift runtime handles these crashes gracefully, but the impact is significant as it can be exploited as a denial-of-service vector when decoding BER/DER data from untrusted sources, such as TLS certificates. The vulnerability arises from the library's failure to enforce DER format correctness on the early node parser, which relies on these incorrect assumptions later in decoding.

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