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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-9675

CVE-2026-9675: 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.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityMedium5.9

    Medium [CVE-2026-9675] undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

    CVE-2026-9675Source published Source updated

    Impact: The undici WebSocket client enforces maxPayloadSize per-frame but does not enforce the cumulative size of fragmented uncompressed messages. A malicious WebSocket server can stream many small fragments that each pass per-frame validation but collectively exceed the configured limit, causing unbounded memory growth in the client process. The result is memory exhaustion and a denial of service. Affected applications are those using the undici WebSocket client (new WebSocket(...)) that can be induced to connect to an attacker-controlled or compromised WebSocket endpoint. This is a regression specific to undici 8.1.0. The 6.25.0 line shipped the equivalent cumulative check from the start and is unaffected. The 7.x line never had the maxPayloadSize feature and is also unaffected.…

    Affected products in this advisory
    • Red Hat Hardened Images
    • Self-service automation portal 2
    Source-reported affected versions
    • 6.25.0
    Source-reported fixed versions
    • 8.5.0
    • nodejs26-main-26.3.0-1.2.hum1
    • rust-main-1.96.0-1.hum1
    • nodejs24-main-24.16.0-1.hum1

    5 more entries in the full advisory.

    Mitigation guidance
    • Red Hat products that bundle the undici HTTP client ship versions 5.x, 6.x, and 7.x, which do not contain the vulnerable WebSocket frame accumulation code path introduced in undici 8.0.0. No Red Hat product streams are affected by this vulnerability. Users who have manually installed undici 8.x outside of Red Hat-provided packages should upgrade to undici 8.5.0 or later to fully resolve this issue.
    Full advisory and evidenceOpen source bulletin

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