CVE-2026-43820

HighCVSS 7.7/10Last modified Oct 24, 2026

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.

Metrics

CVSS 3.1 7.7/10CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Weakness enumeration

CWE-125

Affected software

No affected versions have been published.

Timeline

Published: Jul 23, 2026
Last modified: Oct 24, 2026
NVD status: Analyzed

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