high7.7
CVE-2026-43820
NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apple | Swiftnio Ssl | from 2.18.0 before 2.37.2 |