7.7
High
CVE-2026-43820 NIOSSLCertificate._subjectAlternativeNames provides access to the raw bytes for a cert's SANs
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.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| swift-nio-ssl 2.37 | earliest → < 2.37.2 | 2.37.2 |
References
- github.com github.com
Timeline
- Published
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