CVE-2026-6621

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 v3 7.3 HIGH
CVSS v2.0 7.5 HIGH

7.3^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

7.5^/10

CVSS v2.0 : HIGH

Vector : AV:N/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 10.0 / Impact : 6.4

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References

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

Configurations

No configuration.

History

20 Apr 2026, 09:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-04-20 09:16

Updated : 2026-04-29 01:00

NVD link : CVE-2026-6621

Mitre link : CVE-2026-6621

CVE.ORG link : CVE-2026-6621

JSON object : View

Products Affected

No product.

CWE

CWE-94

Improper Control of Generation of Code ('Code Injection')

CWE-1321

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

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