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Fencer Vulns
critical 9.8

CVE-2024-27307 json

JSONata expression can pollute the "Object" prototype

published 2024-03-04 2 y ago modified 2026-09-10 1 mo ago also GHSA-fqg8-vfv7-8fj8 , EUVD-2024-0922

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

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
2 y ago

Exploit prediction

1.42% chance of exploitation in the next 30 days, higher than 73% of all scored CVEs (FIRST EPSS, 2026-11-08).

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 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.