CVE-2026-43820
Published:July 23, 2026
Updated:August 06, 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.
Affected Packages
SwiftNIOSSL (COCOAPODS):
Affected version(s) =2.19.0 <2.37.2Fix Suggestion:
Update to version 2.37.2https://github.com/apple/swift-nio-ssl.git (GITHUB):
Affected version(s) >=2.18.0 <2.37.2Fix Suggestion:
Update to version 2.37.2Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
7
Attack Vector
LOCAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.7
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Out-of-bounds Read
EPSS
Base Score:
0.08