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CVE-2026-43820

Quick assessment

Affected
Apple swift-nio-ssl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apple swiftnio ssl是美国Apple公司开源的一个支持SSL的网络通信库。 Apple SwiftNIO SSL 2.37.2之前版本存在安全漏洞，该漏洞源于NIOSSLCertificate._subjectAlternativeNames在访问缓冲区时假设其由ASN1_STRING支持，但并非所有SANs都由此支持，可能导致越界内存访问。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
Apple swift-nio-ssl < 2.37.2 affected
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I. Basic Information for CVE-2026-43820

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Apple SwiftNIO SSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apple swiftnio ssl是美国Apple公司开源的一个支持SSL的网络通信库。 Apple SwiftNIO SSL 2.37.2之前版本存在安全漏洞，该漏洞源于NIOSSLCertificate._subjectAlternativeNames在访问缓冲区时假设其由ASN1_STRING支持，但并非所有SANs都由此支持，可能导致越界内存访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apple swift-nio-ssl 0 ~ 2.37.2 -

II. Public POCs for CVE-2026-43820

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III. Intelligence Information for CVE-2026-43820

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Vendor Advisories for CVE-2026-43820 (1)

Same Patch Batch · Apple · 2026-07-23 · 3 CVEs total

CVE-2026-43823 Apple Swift Crypto 安全漏洞
CVE-2026-64785 Apple swift-nio-http2 安全漏洞

IV. Related Vulnerabilities

Same vendor: Apple

V. Comments for CVE-2026-43820

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