Command Injection in jison

published 2020-07-15 6 y ago modified 2026-09-10 1 mo ago also GHSA-vr9x-mm65-2438 , EUVD-2020-1438

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.6%; EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits: 0; none known

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

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8178 updated 2026-03-03 cvss 7.8

nodejs-jison-lex: insufficient input validation can lead to OS command injection

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

3.63% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

hackerone.com https://hackerone.com/reports/690010 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected products

n/a jison

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

hackerone.com /reports/690010
web, exploit, third-party-advisory
nvd.nist.gov /vuln/detail/CVE-2020-8178
advisory

Sources

CVE List CVE-2020-8178
GitHub Advisory GHSA-vr9x-mm65-2438
NVD CVE-2020-8178

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary