VDB
CVE-2026-43820
CVE-2026-43820
PUBLISHED
CVSS 7.7 HIGH
Reported by apple · Published July 23, 2026
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.
Risk Scores
CVSS 3.1
7.7
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apple | swift-nio-ssl | 0 |
| Apple | swift-nio-ssl | 0, 0 |
Timeline
- Jul 23, 2026 CVE Published
- Jul 24, 2026 Coalition ESS Score
- Jul 24, 2026 CVE Updated
- Jul 25, 2026 EPSS Score