CVE-2026-43820

Published: Lug 23, 2026 Last Modified: Lug 24, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 7,7
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: none
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: high

Description

AI Translation Available

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.

125

Out-of-bounds Read

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Other
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Varies By Context
Applicable Platforms
Languages: Memory-Unsafe, C, C++
Technologies: ICS/OT
View CWE Details
https://github.com/apple/swift-nio-ssl/security/advisories/…
https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j
https://github.com/apple/swift-nio-ssl/security/advisories/…
https://github.com/apple/swift-nio-ssl/security/advisories/GHSA-xfxg-9975-pc2j