CVE-2026-6621CWE-1321CWE-94

1024bit extend-deep index.js prototype pollution

Medium · published April 20, 2026

CVSS v4.0
6.9
EPSS
1%
Percentile
45.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
EPSS
0.00558 · 45.7th percentile
Weaknesses
CWE-1321 · Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution'); CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-04-20T08:30Z
EPSS history
Timeline
  • 20 APR 08:30Z
    1024bit extend-deep index.js prototype pollution
    cvelistv5