Swift-NIO-SSH OOB Stack Write before 0.14.1
CVE-2026-43798 Published on August 20, 2026
A single crafted SSH message gives an unauthenticated network attacker an out-of-bounds stack write of attacker-controlled length and content against any application built on swift-nio-ssh. This vulnerability is addressed in swift-nio-ssh version 0.14.1.
Vulnerability Analysis
CVE-2026-43798 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Weakness Type
What is a Stack Overflow Vulnerability?
A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
CVE-2026-43798 has been classified to as a Stack Overflow vulnerability or weakness.
Products Associated with CVE-2026-43798
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Affected Versions
Apple swift-nio-ssh:- Before 0.14.1 is affected.