PatchTheCVECVE-2020-8178: Insufficient input validation in npm package `jison` <= 0.4.18 may lead to OS command injection attacks.
CVE-2020-8178 is a critical-severity flaw (CVSS 9.8) affecting jison. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Insufficient input validation in npm package `jison` <= 0.4.18 may lead to OS command injection attacks.
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 3.6% (top 10%) |
| CISA exploited list | No |
| Weakness | CWE-78 |
| Published | 2020-07-15 |
| 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-2020-8178?
jison: upgrade to newer than 0.4.18. Exact commands for each OS are on this page.
Is CVE-2020-8178 being exploited?
CVE-2020-8178 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-2020-8178 affect?
CVE-2020-8178 affects jison. Severity is critical (CVSS 9.8). Insufficient input validation in npm package `jison` <= 0.4.18 may lead to OS command injection attacks.
How urgent is CVE-2020-8178?
Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action