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CVE-2020-28499

29
FAUCET Score

CVE-2020-28499 describes a critical Prototype Pollution vulnerability affecting all versions of the 'merge' package, specifically through the '_recursiveMerge' function. With a CVSS score of 9.8, this flaw allows unauthenticated attackers to remotely execute arbitrary code or cause denial of service with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While no public exploits, Metasploit modules, or Nuclei templates are currently available, and there's minimal community discussion or media coverage, the high severity warrants attention.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.1.1CPE matchmatch criteria
cpe:2.3:a:merge_project:merge:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

7.3HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.44%
Probability of exploitation in next 30 days
EPSS Percentile
70.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0144 is in the 57th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

npmpatch availablevia ghsa
Product: mergeFixed in: 2.1.1

Vendor Advisories (1)

npmGHSA-7wpw-2hjm-89gphigh

Prototype Pollution in merge

May 4, 2021

References

vuldb.com
Third Party Advisory
github.com / yeikos/js.merge/blob/master/src/index.ts%23L64
Broken Link
snyk.io / vuln/SNYK-JAVA-ORGWEBJARSNPM-1071049
Broken Link
snyk.io / vuln/SNYK-JS-MERGE-1042987
Broken Link