CVE-2026-59171
JSON-java: JSONTokener Unbounded Numeric String Resource-Exhaustion DoS
JSON-java is a reference implementation of a JSON package in Java. From version 20150729 through 20260522, JSONTokener.nextSimpleValue can accumulate unbounded numeric tokens before JSONObject.stringToNumber passes them to BigInteger or BigDecimal conversion without a length limit. An application that parses attacker-controlled JSON or XML through JSONObject, JSONArray, or XML.toJSONObject can spend super-linear CPU time converting a sufficiently long numeric literal, blocking request-handling threads and causing denial of service. Strict mode and keep-strings settings in JSONParserConfiguration do not prevent the affected conversion path. Version 20260719 limits numeric conversion length.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| JSON-java stleary |
>= 20150729, < 20260719 (affected) | CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.9 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/stleary/JSON-java/security/advisories/GHSA-ghc9-756g-vrcvCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/stleary/JSON-java/pull/1065CNA: GitHub_M · x_refsource_MISC
- https://github.com/stleary/JSON-java/pull/1067CNA: GitHub_M · x_refsource_MISC
- https://github.com/stleary/JSON-java/commit/703ac34a55400f9c50889e3d0c778b6d7962e81cCNA: GitHub_M · x_refsource_MISC
- https://github.com/stleary/JSON-java/commit/ab92bb9088a37f9e346cd1dda66f6a3c40a201e0CNA: GitHub_M · x_refsource_MISC
- https://github.com/stleary/JSON-java/commit/fce83c91bb229dde472283dea648a9a8955237fdCNA: GitHub_M · x_refsource_MISC
- https://github.com/stleary/JSON-java/releases/tag/20260719CNA: GitHub_M · x_refsource_MISC
For agents and automation
Read public disclosures for free as Markdown or JSON. Compatible browsers also expose native WebMCP tools to search disclosures, read this page, and discover API access.
Use the ontology-linked Cyber API with x402 pay per request, or a Y2 Pro or Elite API key with the intel:cyber scope.
Endpoints and access details
https://api.y2.dev/api/v2/cyber/cveshttps://api.y2.dev/api/v2/cyber/cves/{cveId}
A workspace owner or admin can create a Pro or Elite API key. Send Authorization: Bearer <Y2_API_KEY> from your trusted agent runtime.
For x402, omit Authorization and read the HTTP 402 payment challenge before signing a retry. Public browser tools do not make payments.