Out-of-Bounds Stack Write Vulnerability in Swift NIO SSH by Apple
CVE-2026-43798

9.8CRITICAL

Key Information:

Vendor

Apple
Status
Swift-nio-ssh
Vendor
CVE Published:
20 August 2026

What is CVE-2026-43798?

A crafted SSH message can exploit an out-of-bounds stack write vulnerability in applications built on swift-nio-ssh. This allows an unauthenticated network attacker to manipulate memory, leading to unpredictable behavior or service disruption. The issue has been addressed in swift-nio-ssh version 0.14.1, and it is essential for users to upgrade to this version to ensure application security.

Affected Version(s)

swift-nio-ssh 0 < 0.14.1

References

https://github.com/apple/swift-nio-ssh/security/advisorie...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.