What’s Vulnerable › Vulnerabilities

CVE-2026-52746: JSONata: Malicious inputs to "$toMillis" function can cause resource exhaustion

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-17 · updated 2026-10-24
• Weakness: CWE-1333

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.

Affected products

• jsonata-js jsonata: before 2.2.0 — fixed in 2.2.0

How to fix

Upgrade to a fixed version: jsonata-js jsonata 2.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/jsonata-js/jsonata/commit/80ba95d170f74e3f20f4f36b8b77d8c85cea7686
• https://github.com/jsonata-js/jsonata/commit/d6ffc17cb16a8e53c222205bd274624e919cce0b
• https://github.com/jsonata-js/jsonata/pull/782
• https://github.com/jsonata-js/jsonata/pull/793
• https://github.com/jsonata-js/jsonata/releases/tag/v1.8.9
• https://github.com/jsonata-js/jsonata/releases/tag/v2.2.0
• https://github.com/jsonata-js/jsonata/security/advisories/GHSA-86vw-mfpg-wwv9

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