Sneak peek: A new ASN.1 API for Python

Summary: Trail of Bits, funded by Alpha-Omega, is building a new ASN.1 API for PyCA Cryptography that wraps rust-asn1, aiming to address performance, parser differentials, and modernization gaps in existing pure-Python libraries like pyasn1. The post notes that ASN.1 encoding rules have historically been a rich source of memory corruption and denial-of-service vulnerabilities, and that parser differentials are a consistent source of major security incidents.
Why it matters: Every TLS handshake depends on X.509 path validation built on ASN.1 parsers, and the post identifies parser differentials as a consistent source of major security incidents - so the number of independent ASN.1 parsers in your stack is a direct measure of exposure.

Read the original at Trail of Bits Blog ↗