CVE-2021-23426
Prototype Pollution
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Prototype Pollution
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
- Record
CVE-2021-23426- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-1982
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
- Record
EUVD-2021-1982- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-58g2-9fqr-36q2
Prototype Pollution in Proto
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
- Record
GHSA-58g2-9fqr-36q2- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
NVD
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
- Record
CVE-2021-23426- CVSS 3.1
- 5.6 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
OSVGHSA-58g2-9fqr-36q2
Prototype Pollution in Proto
This affects all versions of package Proto. It is possible to inject pollute the object property of an application using Proto by leveraging the merge function.
- Record
GHSA-58g2-9fqr-36q2- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-1321
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
Protonpm | through 1.1.4 | None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| 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-2021-23426 is a medium vulnerability (CVSS 5.6) in Proto Project Proto, published September 1, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.86%, the 59th percentile. No source names a fixed version.