Vulnerability in Jsonata
CVE-2026-52746
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.
Vulnerability class: ReDoS (Regular Expression Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (52.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Jsonata
- Jsonata-Js Jsonata — versions < 2.2.0, < 1.8.9, >= 2.0.0, < 2.2.0
Weakness classification (CWE)
References
- github.com/jsonata-js/jsonata/security/advisories/GHSA-86vw-mfpg-wwv9 (Patch, Vendor Advisory)
- github.com/jsonata-js/jsonata/pull/782 (Patch, Issue Tracking)
- github.com/jsonata-js/jsonata/pull/793 (Patch, Issue Tracking)
- github.com/jsonata-js/jsonata/commit/80ba95d170f74e3f20f4f36b8b77d8c85cea7686 (Patch)
- github.com/jsonata-js/jsonata/commit/d6ffc17cb16a8e53c222205bd274624e919cce0b (Patch)
- github.com/jsonata-js/jsonata/releases/tag/v2.2.0 (Product, Release Notes)
- github.com/jsonata-js/jsonata/releases/tag/v1.8.9
Frequently asked questions
- What is CVE-2026-52746?
- CVE-2026-52746 is a high-severity vulnerability in Jsonata, classified under Inefficient Regular Expression Complexity. CVSS score: 7.5/10. Published 2026-07-17.
- How severe is CVE-2026-52746?
- High severity. CVSS v3 base score is 7.5 out of 10.