CVE-2026-43820EPSS p1.1%
CVE-2026-43820CVE-2026-43820
apple / swiftnio_ssl
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.
Scoring
| CVSS | 7.7 () |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
| EPSS | 0.11% probability of exploitation · percentile 1.1% · 2026-10-06T12:00:23Z |
| Last modified | 2026-09-04 |