What is CVE-2021-26505?

CVE-2021-26505 is a critical-severity vulnerability in Hello.js Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2023-08-11.

How severe is CVE-2021-26505?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-26505 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Prototype Pollution in Hello.js Project

CVE-2021-26505

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

Vulnerability class: Prototype Pollution

EPSS: 0.010 (57.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Hello.js_project Hello.js — versions 1.18.6
N/a — versions n/a

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

cve@mitre.org (Issue Tracking)

Frequently asked questions

What is CVE-2021-26505?: CVE-2021-26505 is a critical-severity vulnerability in Hello.js Project, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2023-08-11.
How severe is CVE-2021-26505?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-26505 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.