Prototype Pollution

published 2021-07-02 5 y ago modified 2026-06-17 4 mo ago also GHSA-7qm6-9v49-38m9 , EUVD-2021-2473

cvss: 7.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

All versions of package record-like-deep-assign are vulnerable to Prototype Pollution via the main functionality.

Exploit prediction

1.17% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

snyk.io https://snyk.io/vuln/SNYK-JS-RECORDLIKEDEEPASSIGN-1311024 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C
CNA	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
GitHub	3.1	7.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected packages

ecosystem	package	affected	fixed in
npm	record-like-deep-assign	<=1.0.1	no fix listed

Affected products

n/a record-like-deep-assign

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes
CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes

References

snyk.io /vuln/SNYK-JS-RECORDLIKEDEEPASSIGN-1311024
web, exploit, third-party-advisory
github.com /kripod/record-like-deep-assign/blob/v1.0.1/src/mod.ts%23L17-L35
web, broken-link
nvd.nist.gov /vuln/detail/CVE-2021-23402
advisory
github.com /kripod/record-like-deep-assign
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary