CVE-2026-59171: medium-severity vulnerability in stleary JSON-java
JSON-java: JSONTokener Unbounded Numeric String Resource-Exhaustion DoS
Published
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10Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 5.9
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
stleary · JSON-javaReferences
https://github.com/stleary/JSON-java/commit/703ac34a55400f9c50889e3d0c778b6d7962e81chttps://github.com/stleary/JSON-java/commit/ab92bb9088a37f9e346cd1dda66f6a3c40a201e0https://github.com/stleary/JSON-java/commit/fce83c91bb229dde472283dea648a9a8955237fdhttps://github.com/stleary/JSON-java/pull/1065https://github.com/stleary/JSON-java/pull/1067https://github.com/stleary/JSON-java/releases/tag/20260719https://github.com/stleary/JSON-java/security/advisories/GHSA-ghc9-756g-vrcv