Is defu affected by CVE-2026-35209?

npm defu is affected in <6.1.5.

Is CVE-2026-35209 being exploited?

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

high

CVE-2026-35209

Q: Is CVE-2026-35209 being exploited?

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

npm · defu

Summary

defu: Prototype pollution via `__proto__` key in defaults argument

Severity: high
EPSS: 0.4% (p31)
Also known as: GHSA-737v-mqg7-c878
Published: 2026-04-04

References

https://github.com/unjs/defu/security/advisories/GHSA-737v-mqg7-c878
https://nvd.nist.gov/vuln/detail/CVE-2026-35209
https://github.com/unjs/defu/pull/156

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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.