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CVE-2026-25047

CriticalPublished

deepHas vulnerable to Prototype Pollution via constructor.prototype

Published: Jan 29, 2026
Updated: Feb 2, 2026
Assigning CNA: GitHub_M
Evidence observed: Apr 30, 2026

Primary CVSS

9.4/ 10Critical

nvd · CVSS 4.0

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 52.8%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

deepHas provides a test for the existence of a nested object key and optionally returns that key. A prototype pollution vulnerability exists in version 1.0.7 of the deephas npm package that allows an attacker to modify global object behavior. This issue was fixed in version 1.0.8.

Sources

deephas-1.0.7-Prototype-Pollution-PoC-CVE-2026-25047-PoC
Proof-of-concept demonstrating prototype pollution in deephas <=1.0.7 (CVE-2026-25047) leading to arbitrary code execution and denial of service, with two bypass techniques.
deephas 1.0.7 - Prototype PollutionExploit
banyamer · multiple · Apr 30, 2026

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