High [CVE-2026-43678] Denial of Service via specially crafted WebSocket frame
This high-severity Red Hat Linux advisory covers CVE-2026-43678.
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Summary
Denial of Service via specially crafted WebSocket frame. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-770.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 11 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 11 hours ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 11 hours ago·verify at source
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