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CVE-2021-28860

Prototype Pollution in mixme

9.1 CriticalFix available

In Node.js mixme, prior to v0.5.1, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
High

Exploit likelihood

1.84%Up 0.5 points since May 4, 2021
90%50%10%1%

What each source reports

NVD Score used 9.1

In Node.js mixme, prior to v0.5.1, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
CVE-2021-28860
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
CVSS 2.0
6.4 MediumAV:N/AC:L/Au:N/C:N/I:P/A:P
Weakness
CWE-1321
Updated
2026-11-02
CVE List No score

In Node.js mixme, prior to v0.5.1, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
CVE-2021-28860
Updated
2026-11-02
EUVDEUVD-2022-1163 No score

In Node.js mixme, prior to v0.5.1, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
EUVD-2022-1163
Updated
2026-11-02
GitHub AdvisoriesGHSA-r5cq-9537-9rpf 9.1

Prototype Pollution in mixme

Node.js mixme 0.5.0, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
GHSA-r5cq-9537-9rpf
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness
CWE-1321
Updated
2026-11-02
OSV 9.1

In Node.js mixme, prior to v0.5.1, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
CVE-2021-28860
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Updated
2026-11-02
OSVGHSA-79jw-6wg7-r9g4 7.1

Use of Potentially Dangerous Function in mixme

Impact

In Node.js mixme v0.5.0, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Patches

The problem is corrected starting with version 0.5.1.

References

Issue: https://github.com/adaltas/node-mixme/issues/1 Commit: https://github.com/adaltas/node-mixme/commit/cfd5fbfc32368bcf7e06d1c5985ea60e34cd4028

Record
GHSA-79jw-6wg7-r9g4
CVSS 3.1
7.1 HighCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Weakness
CWE-913
Updated
2026-11-02
OSVGHSA-r5cq-9537-9rpf 9.1

Prototype Pollution in mixme

Node.js mixme 0.5.0, an attacker can add or alter properties of an object via 'proto' through the mutate() and merge() functions. The polluted attribute will be directly assigned to every object in the program. This will put the availability of the program at risk causing a potential denial of service (DoS).

Record
GHSA-r5cq-9537-9rpf
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Weakness
CWE-1321
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mixme
npm
before 0.5.1
0.5.1
mixme
npm
From an advisory covering 2 CVEs
before 0.5.1
0.5.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-28860 is a critical vulnerability (CVSS 9.1) in Adaltas Mixme, published May 3, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.84%, the 79th percentile. Fixed in mixme 0.5.1.

References

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