CVE-2026-43678
CVE-2026-43678: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
Vendor advisory comparison
Red Hat
1 advisory- Advisory severityHigh7.5
High [CVE-2026-43678] Denial of Service via specially crafted WebSocket frame
CVE-2026-43678Source published Source updated
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. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Red Hat lists Red Hat Hardened Images as not affected.
- Affected products in this advisory
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- Affected-version details not available in this record.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- To mitigate this issue, restrict network access to services utilizing `swift-nio` WebSocket functionality to trusted clients or networks. Implement firewall rules to limit inbound connections to the specific port(s) used by the vulnerable service. For example, using `firewalld` on Red Hat Enterprise Linux, administrators can add rules to allow traffic only from specific source IP addresses or ranges. This action limits the attack surface, but may impact legitimate users if not configured to allow necessary access. After applying firewall rules, reload the firewall configuration.
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