CVE-2026-43820
High · 7.7CVSS
7.7
EPSS
0.1%
Published
Jul 23, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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