CVE-2026-43798 Memory corruption in swift-nio-ssh
Unauthenticated attackers can execute arbitrary code via a crafted SSH message causing stack corruption in applications using swift-nio-ssh.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-43798?
CVE-2026-43798 is a critical memory corruption vulnerability in Apple swift-nio-ssh, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-121
Which versions are affected by CVE-2026-43798?
It affects 1 product.
Products include Apple Swiftnio Ssh.
How do I fix CVE-2026-43798?
No fix has been published for CVE-2026-43798 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-43798 being exploited?
There is no known exploitation of CVE-2026-43798 in the wild and no public exploit code.
Sources
Also known as GHSA-998x-vgvp-xwpc.