PatchTheCVECVE-2021-23426: This affects all versions of package Proto
CVE-2021-23426 is a medium-severity flaw (CVSS 5.6) affecting proto. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Public exploit reference
- Remotely exploitable, no login, no user action
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 5.6 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | High |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.9% (top 41%) |
| CISA exploited list | No |
| Published | 2021-09-01 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-23426?
proto: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2021-23426 being exploited?
CVE-2021-23426 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-23426 affect?
CVE-2021-23426 affects proto. Severity is medium (CVSS 5.6). 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.
How urgent is CVE-2021-23426?
Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action