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TI-2021-08268 Aliases CVE-2021-26505GHSA-g3vf-47fv-8f3c

Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote…

Priority HIGH 82CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub.

Summary

Prototype pollution vulnerability in MrSwitch hello.js version 1.18.6, allows remote attackers to execute arbitrary code via hello.utils.extend function.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01144 66th percentileScored 2026-11-07
Fix Fixed hellojs (npm): 1.18.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—hellojs (npm)before 1.18.81.18.8Patch availableGHSA-g3vf-47fv-8f3c
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • hellojs (npm) Vendor— Affected before 1.18.8 Fixed in 1.18.8 Patch available GHSA-g3vf-47fv-8f3c

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:hello.js_project:hello.js:1.18.6:*:*:*:*:node.js:*:*1.18.6VulnerableHello.js Project
  • cpe:2.3:a:hello.js_project:hello.js:1.18.6:*:*:*:*:node.js:*:* Versions 1.18.6 Vulnerable ·Hello.js Project

Remediation

  • Fix · GHSA-g3vf-47fv-8f3c hellojs (npm) Fixed in 1.18.8 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26505
  2. 2026-10-03 Alias added: GHSA-g3vf-47fv-8f3c

References

Advisory 1

Other 3

  • TI-2020-06259 Cross-site scripting (XSS) in hellojs CVSS 3.1CRITICAL 9.9

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences