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CVE-2026-43678

MEDIUM
5.3
CVSS Score
Published: August 20, 2026 at 06:57 PM UTC
Updated: October 18, 2026 at 08:10 PM UTC
2 products affected across 1 vendorSwiftnioswift-nio

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

An unauthenticated remote peer can crash any NIOWebSocket-based server (including Vapor and Hummingbird) with a single 11-byte frame sent after a completed WebSocket handshake, dropping all active connections until the process restarts. This vulnerability is addressed in swift-nio version 2.101.0.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Swiftnio· Apple
95%
v < 2.101.0
Affected range stops below 2.101.0, so it looks safe — our inference, not a vendor statement
swift-nio· Apple
76%
0 ≤ v < 2.101.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Source: cverecord
https://github.com/apple/container/security/advisories/GHSA-2v2q-4q35-h585
Vendor Advisory
Source: cverecord
https://github.com/apple/swift-nio/security/advisories/GHSA-qcc5-f287-vgmq

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-20CWE-770

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