{"schema_version":1,"title":"Urllib3 vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 9 vulnerabilities in Urllib3: 0 in the last 7 days and 3 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-97689, was published on 29 September 2026. Nothing in the last four weeks, down from 3 vulnerabilities in the four before. 1 technology has a page of its own.","url":"https://junglewise.ai/threats/vendors/urllib3","json_url":"https://junglewise.ai/threats/vendors/urllib3.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/urllib3","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"vendor","thin":false,"counts":{"high":6,"all_time":9,"critical":0,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":3,"last_365_days":8},"latest":[{"cve":"CVE-2026-97689","cvss":4,"epss":0.0029,"slug":"cve-2026-97689-urllib3-is-an-http-client-library-for-python-from-1-10-3-until-2","title":"urllib3 HTTP client unbounded memory allocation in chunked transfer","severity":"high","exploited":false,"published_at":"2026-09-29T16:17:18.837+00:00","url":"https://junglewise.ai/threats/cve-2026-97689-urllib3-is-an-http-client-library-for-python-from-1-10-3-until-2"},{"cve":"CVE-2026-97688","cvss":4,"epss":0.0029,"slug":"cve-2026-97688-urllib3-is-an-http-client-library-for-python-from-2-6-2-until-2-8","title":"urllib3 infinite loop in Deflate decoder","severity":"medium","exploited":false,"published_at":"2026-09-29T16:17:18.68+00:00","url":"https://junglewise.ai/threats/cve-2026-97688-urllib3-is-an-http-client-library-for-python-from-2-6-2-until-2-8"},{"cve":"CVE-2026-97687","cvss":4,"epss":0.0024,"slug":"cve-2026-97687-urllib3-is-an-http-client-library-for-python-from-1-26-0-until-2","title":"urllib3 HTTPS proxy TLS settings isolation","severity":"high","exploited":false,"published_at":"2026-09-29T16:17:18.517+00:00","url":"https://junglewise.ai/threats/cve-2026-97687-urllib3-is-an-http-client-library-for-python-from-1-26-0-until-2"},{"cve":"CVE-2024-37891","cvss":3.1,"epss":0.0114,"slug":"cve-2024-37891-urllib3-proxy-authorization-header-leak-in-cross-origin-redirects","title":"PYSEC-2026-1995 - urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirects","severity":"low","exploited":false,"published_at":"2026-07-07T14:34:34.848392+00:00","url":"https://junglewise.ai/threats/cve-2024-37891-urllib3-proxy-authorization-header-leak-in-cross-origin-redirects"},{"cve":"CVE-2026-9375","cvss":7.5,"slug":"cve-2026-9375-urllib3-denial-of-service-via-brotli-decompression-bomb-bypass","title":"urllib3 denial of service via Brotli decompression bomb bypass","severity":"high","exploited":false,"published_at":"2026-06-19T19:16:36.947+00:00","url":"https://junglewise.ai/threats/cve-2026-9375-urllib3-denial-of-service-via-brotli-decompression-bomb-bypass"},{"cve":"CVE-2026-44432","cvss":7.5,"epss":0.0088,"slug":"cve-2026-44432-urllib3-resource-exhaustion-via-improper-handling-of-compressed","title":"urllib3 resource exhaustion via improper handling of compressed data","severity":"high","exploited":false,"published_at":"2026-05-13T16:16:57.303+00:00","url":"https://junglewise.ai/threats/cve-2026-44432-urllib3-resource-exhaustion-via-improper-handling-of-compressed"},{"cve":"CVE-2026-44431","cvss":5.3,"epss":0.0034,"slug":"cve-2026-44431-urllib3-sensitive-header-leak-in-proxymanager-low-level-redirects","title":"urllib3 sensitive header leak in ProxyManager low-level redirects","severity":"medium","exploited":false,"published_at":"2026-05-13T16:16:57.15+00:00","url":"https://junglewise.ai/threats/cve-2026-44431-urllib3-sensitive-header-leak-in-proxymanager-low-level-redirects"},{"cve":"CVE-2025-66471","cvss":7.5,"epss":0.0068,"slug":"cve-2025-66471-urllib3-streaming-api-improper-compression-handling","title":"urllib3 streaming API improper compression handling","severity":"high","exploited":false,"published_at":"2025-12-05T17:16:04.4+00:00","url":"https://junglewise.ai/threats/cve-2025-66471-urllib3-streaming-api-improper-compression-handling"},{"cve":"CVE-2021-33503","cvss":7.5,"epss":0.0327,"slug":"cve-2021-33503-urllib3-redos-in-url-authority-parser","title":"urllib3 ReDoS in URL authority parser","severity":"high","exploited":false,"published_at":"2021-06-01T21:19:32+00:00","url":"https://junglewise.ai/threats/cve-2021-33503-urllib3-redos-in-url-authority-parser"}],"vendor":{"hub":true,"name":"Urllib3","slug":"urllib3","description":"Python HTTP client library providing utilities for making HTTP requests and managing connections.","url":"https://junglewise.ai/threats/vendors/urllib3"},"weekly":[{"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},{"week":"2026-09-28","critical":0,"exploited":0,"vulnerabilities":3},{"week":"2026-10-05","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-12","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-19","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-10-26","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-02","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-11-09","critical":0,"exploited":0,"vulnerabilities":0}],"most_severe":[{"cve":"CVE-2021-33503","cvss":7.5,"epss":0.0327,"slug":"cve-2021-33503-urllib3-redos-in-url-authority-parser","title":"urllib3 ReDoS in URL authority parser","severity":"high","exploited":false,"published_at":"2021-06-01T21:19:32+00:00","url":"https://junglewise.ai/threats/cve-2021-33503-urllib3-redos-in-url-authority-parser"},{"cve":"CVE-2026-44432","cvss":7.5,"epss":0.0088,"slug":"cve-2026-44432-urllib3-resource-exhaustion-via-improper-handling-of-compressed","title":"urllib3 resource exhaustion via improper handling of compressed data","severity":"high","exploited":false,"published_at":"2026-05-13T16:16:57.303+00:00","url":"https://junglewise.ai/threats/cve-2026-44432-urllib3-resource-exhaustion-via-improper-handling-of-compressed"},{"cve":"CVE-2025-66471","cvss":7.5,"epss":0.0068,"slug":"cve-2025-66471-urllib3-streaming-api-improper-compression-handling","title":"urllib3 streaming API improper compression handling","severity":"high","exploited":false,"published_at":"2025-12-05T17:16:04.4+00:00","url":"https://junglewise.ai/threats/cve-2025-66471-urllib3-streaming-api-improper-compression-handling"},{"cve":"CVE-2026-9375","cvss":7.5,"slug":"cve-2026-9375-urllib3-denial-of-service-via-brotli-decompression-bomb-bypass","title":"urllib3 denial of service via Brotli decompression bomb bypass","severity":"high","exploited":false,"published_at":"2026-06-19T19:16:36.947+00:00","url":"https://junglewise.ai/threats/cve-2026-9375-urllib3-denial-of-service-via-brotli-decompression-bomb-bypass"},{"cve":"CVE-2026-97689","cvss":4,"epss":0.0029,"slug":"cve-2026-97689-urllib3-is-an-http-client-library-for-python-from-1-10-3-until-2","title":"urllib3 HTTP client unbounded memory allocation in chunked transfer","severity":"high","exploited":false,"published_at":"2026-09-29T16:17:18.837+00:00","url":"https://junglewise.ai/threats/cve-2026-97689-urllib3-is-an-http-client-library-for-python-from-1-10-3-until-2"},{"cve":"CVE-2026-97687","cvss":4,"epss":0.0024,"slug":"cve-2026-97687-urllib3-is-an-http-client-library-for-python-from-1-26-0-until-2","title":"urllib3 HTTPS proxy TLS settings isolation","severity":"high","exploited":false,"published_at":"2026-09-29T16:17:18.517+00:00","url":"https://junglewise.ai/threats/cve-2026-97687-urllib3-is-an-http-client-library-for-python-from-1-26-0-until-2"},{"cve":"CVE-2026-44431","cvss":5.3,"epss":0.0034,"slug":"cve-2026-44431-urllib3-sensitive-header-leak-in-proxymanager-low-level-redirects","title":"urllib3 sensitive header leak in ProxyManager low-level redirects","severity":"medium","exploited":false,"published_at":"2026-05-13T16:16:57.15+00:00","url":"https://junglewise.ai/threats/cve-2026-44431-urllib3-sensitive-header-leak-in-proxymanager-low-level-redirects"},{"cve":"CVE-2026-97688","cvss":4,"epss":0.0029,"slug":"cve-2026-97688-urllib3-is-an-http-client-library-for-python-from-2-6-2-until-2-8","title":"urllib3 infinite loop in Deflate decoder","severity":"medium","exploited":false,"published_at":"2026-09-29T16:17:18.68+00:00","url":"https://junglewise.ai/threats/cve-2026-97688-urllib3-is-an-http-client-library-for-python-from-2-6-2-until-2-8"},{"cve":"CVE-2024-37891","cvss":3.1,"epss":0.0114,"slug":"cve-2024-37891-urllib3-proxy-authorization-header-leak-in-cross-origin-redirects","title":"PYSEC-2026-1995 - urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirects","severity":"low","exploited":false,"published_at":"2026-07-07T14:34:34.848392+00:00","url":"https://junglewise.ai/threats/cve-2024-37891-urllib3-proxy-authorization-header-leak-in-cross-origin-redirects"}],"generated_at":"2026-11-09T03:07:00.176479+00:00","technologies":[{"name":"Urllib3","slug":"urllib3-urllib3","vulnerabilities":5,"url":"https://junglewise.ai/threats/technologies/urllib3-urllib3"}]}