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CVE-2026-9675

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:5778332875c595b9c023c73ba78f7ad92ecb4be8b8d31b48bcc82333573902d0
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/undici","product":"undici","vendor":"undici","versions":[{"lessThan":"8.5.0","status":"affected","version":"8.0.0","versionType":"semver"},{"status":"unaffected","version":"8.5.0","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"CWE-770: Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-400","description":"CWE-400: Uncontrolled Resource Consumption","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"url":"https://cna.openjsf.org/security-advisories.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/references/1
{"url":"https://github.com/nodejs/undici/security/advisories/GHSA-38rv-x7px-6hhq"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:2e7a086dde539014db41a97b9fee73a243a7ab970d9dd6cb176e51f284b9d1de · sha256:2e6abd0a4b0bd3f6… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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