CVE-2021-23561
Prototype Pollution
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
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
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
- Record
CVE-2021-23561- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-02
EUVDEUVD-2021-2598
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
- Record
EUVD-2021-2598- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vxr4-rxw7-g7v6
Prototype Pollution in comb
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
- Record
GHSA-vxr4-rxw7-g7v6- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-1321
- Updated
- 2026-11-02
NVD
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
- Record
CVE-2021-23561- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-1321
- Updated
- 2026-11-02
OSVGHSA-vxr4-rxw7-g7v6
Prototype Pollution in comb
All versions of package comb are vulnerable to Prototype Pollution via the deepMerge() function.
- Record
GHSA-vxr4-rxw7-g7v6- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L - Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
combnpm |
through 2.0.0 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-23561 is a medium vulnerability (CVSS 6.5) in C2fo Comb, published December 10, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.21%, the 68th percentile. No source names a fixed version.