Is undici affected by CVE-2026-9675?

npm undici is affected in >=8.0.0 <8.5.0.

Is CVE-2026-9675 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

high

CVE-2026-9675

Q: Is CVE-2026-9675 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.4%.

npm · undici

Summary

undici WebSocket client vulnerable to denial of service via cumulative fragment bypass

Severity: high
EPSS: 0.4% (p36)
Also known as: GHSA-38rv-x7px-6hhq
Published: 2026-06-18

References

https://github.com/nodejs/undici/security/advisories/GHSA-38rv-x7px-6hhq
https://nvd.nist.gov/vuln/detail/CVE-2026-9675
https://cna.openjsf.org/security-advisories.html

Related advisories

CVE-2026-13697 — high · npm/undici
CVE-2026-12151 — high · npm/undici
CVE-2026-6734 — high · npm/undici
CVE-2026-9697 — high · npm/undici
CVE-2026-15157 — medium · npm/undici
CVE-2026-14643 — medium · npm/undici
CVE-2026-16729 — medium · npm/undici
CVE-2026-16728 — medium · npm/undici

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.