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CVE-2026-43798

Apple Swiftnio SSH buffer overflow

9.8 CRITICALEPSS 0.47%
  1. Published20 Aug 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apple Swiftnio SSH< 0.14.1

Remediation

Fixed in
Apple Swiftnio SSH≥ 0.14.1

References

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Frequently asked

Is CVE-2026-43798 being actively exploited?

CVE-2026-43798 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.47%.

How severe is CVE-2026-43798?

CVE-2026-43798 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2026-43798?

Affected products include Apple Swiftnio SSH.

How do I fix CVE-2026-43798?

Upgrade affected software to a fixed version, for example Apple Swiftnio SSH 0.14.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-43798 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.