Prototype Pollution

published 2022-08-09 4 y ago modified 2026-06-17 4 mo ago also GHSA-7qqq-gh2f-wq76 , EUVD-2022-6507

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.9%; EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits: 0; none known

The package ts-deepmerge before 2.0.2 are vulnerable to Prototype Pollution due to missing sanitization of the merge function.

Patch / fix

fixed in 2 links 3

npm ts-deepmerge 2.0.2
n/a ts-deepmerge 2.0.2

Exploit prediction

1.90% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

security.snyk.io https://security.snyk.io/vuln/SNYK-JS-TSDEEPMERGE-2959975 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	ts-deepmerge	<2.0.2	2.0.2

Affected products

n/a ts-deepmerge

Classification

Weakness

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

github.com /voodoocreation/ts-deepmerge/commit/9be5148773343c57be9de39728d6ead18eddf10b
web, patch, third-party-advisory
security.snyk.io /vuln/SNYK-JS-TSDEEPMERGE-2959975
web, exploit, patch, third-party-advisory
github.com /voodoocreation/ts-deepmerge/releases/tag/2.0.2
web, release-notes, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2022-25907
advisory
github.com /voodoocreation/ts-deepmerge
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