What’s Vulnerable › Vulnerabilities

CVE-2024-27307: JSONata expression can pollute the "Object" prototype

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-03-06 · updated 2026-06-17
• Weakness: CWE-1321

Description

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.

Affected products

• jsonata-js jsonata: from 1.4.0 before 1.8.7; from 2.0.0 before 2.0.4 — fixed in 1.8.7, 2.0.4

How to fix

Upgrade to a fixed version: jsonata-js jsonata 1.8.7, 2.0.4. Check the vendor advisory for mitigations.

References

• https://github.com/jsonata-js/jsonata/commit/1d579dbe99c19fbe509f5ba2c6db7959b0d456d1
• https://github.com/jsonata-js/jsonata/commit/335d38f6278e96c908b24183f1c9c90afc8ae00c
• https://github.com/jsonata-js/jsonata/commit/c907b5e517bb718015fcbd993d742ba6202f2be2
• https://github.com/jsonata-js/jsonata/releases/tag/v2.0.4
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-fqg8-vfv7-8fj8
• https://github.com/jsonata-js/jsonata/commit/1d579dbe99c19fbe509f5ba2c6db7959b0d456d1
• https://github.com/jsonata-js/jsonata/commit/335d38f6278e96c908b24183f1c9c90afc8ae00c
• https://github.com/jsonata-js/jsonata/commit/c907b5e517bb718015fcbd993d742ba6202f2be2
• https://github.com/jsonata-js/jsonata/releases/tag/v2.0.4
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-fqg8-vfv7-8fj8

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