{"schema_version":1,"title":"UltraJSON vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 4 vulnerabilities in UltraJSON: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-54911, was published on 22 June 2026. 1 technology has a page of its own.","url":"https://junglewise.ai/threats/vendors/ultrajson","json_url":"https://junglewise.ai/threats/vendors/ultrajson.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/vendors/ultrajson","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"vendor","counts":{"high":3,"all_time":4,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":0,"last_365_days":4},"latest":[{"cve":"CVE-2026-54911","cvss":6.5,"epss":0.0037,"slug":"cve-2026-54911-ultrajson-improper-input-validation-in-ujson-dumps-utf-8-handling","title":"UltraJSON improper input validation in ujson.dumps UTF-8 handling","severity":"medium","exploited":false,"published_at":"2026-06-22T22:16:50.397+00:00","url":"https://junglewise.ai/threats/cve-2026-54911-ultrajson-improper-input-validation-in-ujson-dumps-utf-8-handling"},{"cve":"CVE-2026-44660","cvss":7.5,"epss":0.0064,"slug":"cve-2026-44660-ultrajson-memory-leak-in-ujson-dump-on-write-failure","title":"UltraJSON memory leak in ujson.dump on write failure","severity":"high","exploited":false,"published_at":"2026-05-27T21:16:17.65+00:00","url":"https://junglewise.ai/threats/cve-2026-44660-ultrajson-memory-leak-in-ujson-dump-on-write-failure"},{"cve":"CVE-2026-32875","cvss":7.5,"epss":0.0077,"slug":"cve-2026-32875-ultrajson-integer-overflow-in-indent-handling","title":"UltraJSON integer overflow in indent handling","severity":"high","exploited":false,"published_at":"2026-03-20T02:16:35.887+00:00","url":"https://junglewise.ai/threats/cve-2026-32875-ultrajson-integer-overflow-in-indent-handling"},{"cve":"CVE-2026-32874","cvss":7.5,"epss":0.0068,"slug":"cve-2026-32874-ultrajson-memory-leak-in-json-parsing-of-large-integers","title":"UltraJSON memory leak in JSON parsing of large integers","severity":"high","exploited":false,"published_at":"2026-03-20T02:16:35.703+00:00","url":"https://junglewise.ai/threats/cve-2026-32874-ultrajson-memory-leak-in-json-parsing-of-large-integers"}],"vendor":{"hub":true,"name":"UltraJSON","slug":"ultrajson","homepage":"https://github.com/ultrajson/ultrajson","description":"UltraJSON is an ultra fast JSON encoder and decoder written in C with bindings for Python.","url":"https://junglewise.ai/threats/vendors/ultrajson"},"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"most_severe":[{"cve":"CVE-2026-32875","cvss":7.5,"epss":0.0077,"slug":"cve-2026-32875-ultrajson-integer-overflow-in-indent-handling","title":"UltraJSON integer overflow in indent handling","severity":"high","exploited":false,"published_at":"2026-03-20T02:16:35.887+00:00","url":"https://junglewise.ai/threats/cve-2026-32875-ultrajson-integer-overflow-in-indent-handling"},{"cve":"CVE-2026-32874","cvss":7.5,"epss":0.0068,"slug":"cve-2026-32874-ultrajson-memory-leak-in-json-parsing-of-large-integers","title":"UltraJSON memory leak in JSON parsing of large integers","severity":"high","exploited":false,"published_at":"2026-03-20T02:16:35.703+00:00","url":"https://junglewise.ai/threats/cve-2026-32874-ultrajson-memory-leak-in-json-parsing-of-large-integers"},{"cve":"CVE-2026-44660","cvss":7.5,"epss":0.0064,"slug":"cve-2026-44660-ultrajson-memory-leak-in-ujson-dump-on-write-failure","title":"UltraJSON memory leak in ujson.dump on write failure","severity":"high","exploited":false,"published_at":"2026-05-27T21:16:17.65+00:00","url":"https://junglewise.ai/threats/cve-2026-44660-ultrajson-memory-leak-in-ujson-dump-on-write-failure"},{"cve":"CVE-2026-54911","cvss":6.5,"epss":0.0037,"slug":"cve-2026-54911-ultrajson-improper-input-validation-in-ujson-dumps-utf-8-handling","title":"UltraJSON improper input validation in ujson.dumps UTF-8 handling","severity":"medium","exploited":false,"published_at":"2026-06-22T22:16:50.397+00:00","url":"https://junglewise.ai/threats/cve-2026-54911-ultrajson-improper-input-validation-in-ujson-dumps-utf-8-handling"}],"generated_at":"2026-09-26T12:07:00.15149+00:00","technologies":[{"name":"UltraJSON","slug":"ultrajson","vulnerabilities":4,"url":"https://junglewise.ai/threats/technologies/ultrajson"}]}