PatchTheCVECVE-2019-10795: undefsafe before 2.0.3 is vulnerable to Prototype Pollution
CVE-2019-10795 is a medium-severity flaw (CVSS 6.3) affecting undefsafe. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
undefsafe before 2.0.3 is vulnerable to Prototype Pollution. The 'a' function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.
Why this priority
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 1.1% (top 35%) |
| CISA exploited list | No |
| Weakness | CWE-74 |
| Published | 2020-02-18 |
| 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-2019-10795?
undefsafe: upgrade to 2.0.3. Exact commands for each OS are on this page.
Is CVE-2019-10795 being exploited?
CVE-2019-10795 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-2019-10795 affect?
CVE-2019-10795 affects undefsafe. Severity is medium (CVSS 6.3). undefsafe before 2.0.3 is vulnerable to Prototype Pollution. The 'a' function could be tricked into adding or modifying properties of Object.prototype using a __proto__ payload.
How urgent is CVE-2019-10795?
Priority 43/100. Public exploit reference