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CVE-2026-6621

1024bit extend-deep index.js prototype pollution

CVSS 6.9 MEDIUMEPSS 0.3%CWE-1321CWE-94
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
CVSS 6.9EPSS 0.3%KEV nãoPoC públicaNuclei Metasploit Patch
Lifecycle
20 Apr 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
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: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
Affected products
1024bit · extend-deep
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

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