High severity · published Jul 17, 2026
CVE-2026-52746
JSONata: Malicious inputs to "$toMillis" function can cause resource exhaustion
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
JSONata is a JSON query and transformation language. Prior to 2.2.0 and 1.8.9, malicious non-matching inputs to the $toMillis function can cause superlinear backtracking in the ISO-8601 validation regex, leading to denial of service in applications that evaluate user-provided JSONata expressions. This issue is fixed in version 2.2.0 and 1.8.9.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
JS
jsonata · jsonata-js
>= 2.0.0, < 2.2.0; < 1.8.9 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-52746
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-52746
Patch
https://github.com/jsonata-js/jsonata/commit/80ba95d170f74e3f20f4f36b8b77d8c85cea7686
Patch
https://github.com/jsonata-js/jsonata/commit/d6ffc17cb16a8e53c222205bd274624e919cce0b
Issue Tracking
https://github.com/jsonata-js/jsonata/pull/782
Issue Tracking
https://github.com/jsonata-js/jsonata/pull/793
github.com
https://github.com/jsonata-js/jsonata/releases/tag/v1.8.9
Product
https://github.com/jsonata-js/jsonata/releases/tag/v2.2.0
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