CVE-2026-43798 json
A single crafted SSH message gives an unauthenticated network attacker an out-of-bounds stack write of attacker-controlled length and conte…
published 2026-08-20 2 mo ago modified 2026-10-18 21 d ago also EUVD-2026-63655
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Apple swift-nio-ssh 0.14.1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 2 mo ago
Exploit prediction
0.47% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Apple swift-nio-ssh
Classification
- Weakness
-
- CWE-121 Stack-based Buffer Overflow
References
-
github.com
/apple/swift-nio-ssh/security/advisories/GHSA-998x-vgvp-xwpc
vendor-advisory, patch
Sources
- CVE List CVE-2026-43798
- NVD CVE-2026-43798
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