CVE-2026-35209
high
CVSS v3
7.5
CVSS v4 NEW
—
VIR risk
7.5
Description
defu: Prototype pollution via `__proto__` key in defaults argument
Predictions
Exploit likelihood
83%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| npm | defu | <6.1.5 | 6.1.5 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| unjs | defu | {"endExcluding":"6.1.5"} | 6.1.5 |
References
- https://github.com/unjs/defu/commit/3942bfbbcaa72084bd4284846c83bd61ed7c8b29
- https://github.com/unjs/defu/pull/156
- https://github.com/unjs/defu/releases/tag/v6.1.5
- 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
CWEs
CWE-1321
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.