PatchTheCVECVE-2021-23568: The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe r
CVE-2021-23568 is a high-severity flaw (CVSS 7.3) affecting extend2. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.
Why this priority
- High severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.3 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.5% (top 27%) |
| CISA exploited list | No |
| Weakness | CWE-1321 |
| Published | 2022-01-10 |
| 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-2021-23568?
extend2: upgrade to 1.0.1. Exact commands for each OS are on this page.
Is CVE-2021-23568 being exploited?
CVE-2021-23568 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-2021-23568 affect?
CVE-2021-23568 affects extend2. Severity is high (CVSS 7.3). The package extend2 before 1.0.1 are vulnerable to Prototype Pollution via the extend function due to unsafe recursive merge.
How urgent is CVE-2021-23568?
Priority 54/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action