Skip to content
Fencer Intel
critical 9.8

CVE-2024-27307 json

JSONata expression can pollute the "Object" prototype

published 2y ago modified 2mo ago also EUVD-2024-0922 , GHSA-fqg8-vfv7-8fj8

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 73%
public exploits
0
none known

Summary

JSONata is a JSON query and transformation language. Starting in version 1.4.0 and prior to version 1.8.7 and 2.0.4, a malicious expression can use the transform operator to override properties on the `Object` constructor and prototype. This may lead to denial of service, remote code execution or other unexpected behavior in applications that evaluate user-provided JSONata expressions. This issue has been fixed in JSONata versions 1.8.7 and 2.0.4. Applications that evaluate user-provided expressions should update ASAP to prevent exploitation. As a workaround, one may apply the patch manually.

Patch / fix

  • npm jsonata 1.8.7, 2.0.4
  • jsonatajs jsonata 1.8.7, 2.0.4

Is CVE-2024-27307 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2024-27307 updated cvss 8.6

jsonata: malicious expression can pollute the "Object" prototype

  • Red Hat Developer Hub 1.2 for RHEL 9 rhdh/rhdh-hub-rhel9 1.2-105
    fixed: vendor fix RHEA-2024:4071
  • Red Hat OpenShift Serverless jsonata Red Hat Developer Hub 1.2 for RHEL 9 rhdh/rhdh-operator-bundle 1.2-97, rhdh/rhdh-rhel9-operator 1.2-103
    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

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
2y ago

Exploit prediction

1.42% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
npm jsonata
>=1.4.0, <1.8.7
>=2.0.0, <2.0.4
1.8.7
2.0.4

Affected products

  • jsonata-js jsonata
  • jsonatajs jsonata

Classification

Weakness
  • CWE-1321 Improperly Controlled Modification of Object Prototype Attributes

References

Sources

Fencer Intel 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.

The maintainers of jsonata-js/jsonata published their own advisory on GitHub. Reviewed sources take precedence over it.