CVE-2026-43798: 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. in Apple swift-nio-ssh
CVE-2026-43798 is a vulnerability in Apple swift-nio-ssh where a single crafted SSH message allows an unauthenticated network attacker to perform an out-of-bounds stack write with attacker-controlled length and content. This flaw affects any application built on swift-nio-ssh versions prior to 0.14.1. The issue is resolved in version 0.14.1.
AI Analysis
Technical Summary
This vulnerability allows an unauthenticated network attacker to send a specially crafted SSH message that triggers an out-of-bounds stack write in any application using the swift-nio-ssh library. The attacker can control both the length and content of the write, potentially leading to memory corruption. The flaw is fixed in swift-nio-ssh version 0.14.1.
Potential Impact
An unauthenticated attacker can cause an out-of-bounds stack write with attacker-controlled data, which may lead to memory corruption and potentially arbitrary code execution or denial of service in applications using vulnerable versions of swift-nio-ssh. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade all affected applications to swift-nio-ssh version 0.14.1 or later to address this vulnerability. No other mitigation or temporary workaround is indicated.
CVE-2026-43798: 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. in Apple swift-nio-ssh
Description
CVE-2026-43798 is a vulnerability in Apple swift-nio-ssh where a single crafted SSH message allows an unauthenticated network attacker to perform an out-of-bounds stack write with attacker-controlled length and content. This flaw affects any application built on swift-nio-ssh versions prior to 0.14.1. The issue is resolved in version 0.14.1.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability allows an unauthenticated network attacker to send a specially crafted SSH message that triggers an out-of-bounds stack write in any application using the swift-nio-ssh library. The attacker can control both the length and content of the write, potentially leading to memory corruption. The flaw is fixed in swift-nio-ssh version 0.14.1.
Potential Impact
An unauthenticated attacker can cause an out-of-bounds stack write with attacker-controlled data, which may lead to memory corruption and potentially arbitrary code execution or denial of service in applications using vulnerable versions of swift-nio-ssh. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade all affected applications to swift-nio-ssh version 0.14.1 or later to address this vulnerability. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apple
- Date Reserved
- 2026-05-01T22:46:27.820Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a87701facd9273b4924711f
Added to database: 08/20/2026, 21:22:39 UTC
Last enriched: 08/20/2026, 21:37:56 UTC
Last updated: 08/21/2026, 01:11:25 UTC
Views: 5
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