CVE-2026-43820 | BDVDB-2026-351925 Detail

Description#

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.

Impact#

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Exploit#

History#

1. Version 12026-07-23Record published in the CVE List.
2. Version 22026-07-24Most recent update recorded in the CVE List.