Vulnerability DatabaseCVE-2026-43671
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CVE-2026-43671
Published:June 12, 2026
Updated:August 27, 2026
A program using swift-nio is vulnerable to a potential out-of-bounds write when attacker-controlled index or length values exceeding "UInt32.max" are passed to some "ByteBuffer" methods. This affects all swift-nio versions from 1.0.0 to 2.99.0. It is fixed in 2.100.0 and later releases.
Affected Packages
github.com/apple/swift-nio (SWIFT):
Affected version(s) >=1.0.0 <2.100.0
Fix Suggestion:
Update to version 2.100.0
Related Resources (2)
https://github.com/apple/swift-nio
https://github.com/apple/swift-nio/security/advisories/GHSA-r3rc-9hpw-54v9
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CVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Out-of-bounds Write
CWE-787