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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.

PUBLISHED Reserved 2026-04-19 | Published 2026-04-20 | Updated 2026-04-20 | Assigner VulDB




MEDIUM: 6.9CVSS: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
HIGH: 7.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
HIGH: 7.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R
7.5AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR

Problem types

Improperly Controlled Modification of Object Prototype Attributes

Code Injection

Product status

0.1.0
affected

0.1.1
affected

0.1.2
affected

0.1.3
affected

0.1.4
affected

0.1.5
affected

0.1.6
affected

Timeline

2026-04-19:Advisory disclosed
2026-04-19:VulDB entry created
2026-04-19:VulDB entry last update

Credits

sudosme (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/358256 (VDB-358256 | 1024bit extend-deep index.js prototype pollution) vdb-entry technical-description

vuldb.com/vuln/358256/cti (VDB-358256 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/792387 (Submit #792387 | 1024bit extend-deep 0.1.6 Prototype Pollution) third-party-advisory

github.com/...ob/main/extend-deep/prototype-pollution/PoC.md exploit

cve.org (CVE-2026-6621)

nvd.nist.gov (CVE-2026-6621)

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