CVE-2026-6621

MEDIUM EPSS 25.4%
Published Apr 20, 20262mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 4.0
Medium
Find Similar
Published Apr 20, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

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 Details

Base Score
5.5
Exploitability
—
Impact
—
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
25.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 2

CWE-1321
CWE-94 Improper Control of Generation of Code (Code Injection) Injection

References 4

  • github.com https://github.com/sudo-secure/security-research/blob/main/extend-deep/prototype-pollution/PoC.md
  • vuldb.com https://vuldb.com/submit/792387
  • vuldb.com https://vuldb.com/vuln/358256
  • vuldb.com https://vuldb.com/vuln/358256/cti

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.