🚨 CVE-2026-43820
NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an ASN1_STRING, but not all SANs are backed by ASN1_STRING, so accessing the buffer for such a type can lead to out-of-bounds memory access. This vulnerability is addressed in swift-nio-ssl version 2.37.2.
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Accessing bytes of non-string SAN can lead to out-of-bounds memory read
### Summary
`NIOSSLCertificate._subjectAlternativeNames` provides access to the raw bytes for a cert's SANs. NIOSSL provides access to a buffer assumed to be backed by an `ASN1_STRING`, but ...
September 4, 2026 31
