What is CVE-2020-8178?

CVE-2020-8178 is a critical-severity vulnerability in Jison Project, classified under OS Command Injection. CVSS score: 9.8/10. Published 2020-07-15.

How severe is CVE-2020-8178?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2020-8178 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Jison Project

CVE-2020-8178

Insufficient input validation in npm package `jison` <= 0.4.18 may lead to OS command injection attacks.

Vulnerability class: Command Injection (OS Command Injection)

Published 2020-07-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.036 (89.2th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 89th percentile — 89.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.036 · newest: 0.036 · change: 0.000

Affected products

Jison Project
Jison — versions Not Fixed

Weakness classification (CWE)

CWE-78 — OS Command Injection

Public proof-of-concept exploits

References

hackerone.com/reports/690010 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-8178?: CVE-2020-8178 is a critical-severity vulnerability in Jison Project, classified under OS Command Injection. CVSS score: 9.8/10. Published 2020-07-15.
How severe is CVE-2020-8178?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-8178 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.