HOMEVULNERABILITIESCVE-2021-26707
CRITICAL

CVE-2021-26707

CWE-1321Published: June 2, 2021· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

The merge-deep library before 3.0.3 for Node.js can be tricked into overwriting properties of Object.prototype or adding new properties to it. These properties are then inherited by every object in the program, thus facilitating prototype-pollution attacks against applications using this library.

NVD Source

Technical Analysis

CVE-2021-26707 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

merge-deep_project1 product(s)
merge-deep
netapp1 product(s)
e-series performance analyzer
Source: NVD CPE · 2 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5
PATCHhttps://github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5
ADVISORYhttps://security.netapp.com/advisory/ntap-20210716-0008/
ADVISORYhttps://securitylab.github.com/advisories/GHSL-2020-160-merge-deep/
ADVISORYhttps://www.npmjs.com/package/merge-deep
ADVISORYhttps://security.netapp.com/advisory/ntap-20210716-0008/
ADVISORYhttps://securitylab.github.com/advisories/GHSL-2020-160-merge-deep/
ADVISORYhttps://www.npmjs.com/package/merge-deep

All References (8)

→
https://github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210716-0008/Third Party Advisory
→
https://securitylab.github.com/advisories/GHSL-2020-160-merge-deep/Third Party Advisory
→
https://www.npmjs.com/package/merge-deepProduct · Third Party Advisory
→
https://github.com/jonschlinkert/merge-deep/commit/11e5dd56de8a6aed0b1ed022089dbce6968d82a5Patch · Third Party Advisory
→
https://security.netapp.com/advisory/ntap-20210716-0008/Third Party Advisory
→
https://securitylab.github.com/advisories/GHSL-2020-160-merge-deep/Third Party Advisory
→
https://www.npmjs.com/package/merge-deepProduct · Third Party Advisory

Quick Facts

CVE IDCVE-2021-26707
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-1321
CISA KEVNo
Affected2 vendor(s)
PublishedJun 2, 2021

Related CVEs (CWE-1321)

CVE-2024-38999
10.0
CVE-2024-39008
10.0
CVE-2023-26121
10.0
CVE-2021-23594
10.0
CVE-2021-23449
10.0
CVE-2020-12079
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-26707 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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