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Fencer Vulns
high 7.1

CVE-2020-7729 json

Arbitrary Code Execution

published 2020-09-03 6 y ago modified 2026-09-10 1 mo ago also GHSA-m5pj-vjjf-4m3h , EUVD-2021-1133

cvss
7.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

The package grunt before 1.3.0 are vulnerable to Arbitrary Code Execution due to the default usage of the function load() instead of its secure replacement safeLoad() of the package js-yaml inside grunt.file.readYAML.

Patch / fix

  • npm grunt 1.3.0
  • n/a grunt 1.3.0
  • grunt Debian 14, Debian 13, Debian 12 1.3.0-1

debian advisories DEBIAN-CVE-2020-7729

  • grunt Ubuntu 18.04 LTS 1.0.1-8ubuntu0.1
  • grunt Ubuntu Pro 20.04 LTS 1.0.4-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-7729

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2020-7729 updated cvss 7.1

nodejs-grunt: use of the unsafe load function from js-yaml package can lead to ACE

  • 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

2.30% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • snyk.io https://snyk.io/vuln/SNYK-JS-GRUNT-597546 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H/RL:O
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:N/AC:H/Au:S/C:P/I:P/A:P
GitHub 3.1 7.1 CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm grunt
<1.3.0
1.3.0

Affected products

  • n/a grunt

Classification

Weakness
  • CWE-1188 Initialization of a Resource with an Insecure Default

References

Sources

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.