CVE-2021-23470

Public Exploit
Prototype Pollution

Description

This affects the package putil-merge before 3.8.0. The merge() function does not check the values passed into the argument. An attacker can supply a malicious value by adjusting the value to include the constructor property. Note: This vulnerability derives from an incomplete fix in https://security.snyk.io/vuln/SNYK-JS-PUTILMERGE-1317077

Category

8.2
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.46% Top 25%
Vendor Advisory snyk.io
Affected: n/a putil-merge
Published at:
Updated at:

References

Link Tags
https://snyk.io/vuln/SNYK-JS-PUTILMERGE-2391487 exploit vendor advisory
https://github.com/panates/putil-merge/commit/476d00078dfb2827d7c9ee0f2392c81b864f7bc5 third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-23470?
CVE-2021-23470 has been scored as a high severity vulnerability.
How to fix CVE-2021-23470?
To fix CVE-2021-23470, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-23470 being actively exploited in the wild?
It is possible that CVE-2021-23470 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-23470?
CVE-2021-23470 affects n/a putil-merge.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.