High 7.3Published Apr 20, 2026

CVE-2026-66211024bit extend-deep index.js prototype pollution

Updated under an hour ago (Oct 27, 2026, 7:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for 1024bit extend-deep

Exploited in the last 30 days

A vulnerability was determined in 1024bit extend-deep up to 0.1.6. The impacted element is an unknown function of the file index.js. This manipulation of the argument __proto__ causes improperly controlled modification of object prototype attributes. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized. The code repository of the project has not been active for many years.

CVSS: 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
Weakness (CWE): CWE-1321, CWE-94
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulDB
NVD analysis: Deferred
Record last updated: Apr 20, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

1024bit extend-deep 1024bit:extend_deep (from the name)	0.1.0; 0.1.1; 0.1.2; 0.1.3; 0.1.4; 0.1.5; 0.1.6	CNA record

References

References

https://vuldb.com/vuln/358256	vdb-entry, technical-description
https://vuldb.com/vuln/358256/cti	signature, permissions-required
https://vuldb.com/submit/792387	third-party-advisory
https://github.com/sudo-secure/security-research/blob/main/extend-deep/prototype-pollution/PoC.md	exploit

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.