Vendor
Urllib3 vulnerabilities
Updated . Rebuilt every hour.
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.
- Last 7 days
- 0
- Last 90 days
- 3
- Critical, all time
- 0
- Exploited in the wild
- 0
About Urllib3
Python HTTP client library providing utilities for making HTTP requests and managing connections.
Urllib3 technologies
Latest Urllib3 vulnerabilities
- CVE-2026-97689: urllib3 HTTP client unbounded memory allocation in chunked transferhighCVSS 4EPSS 0.3%
- CVE-2026-97688: urllib3 infinite loop in Deflate decodermediumCVSS 4EPSS 0.3%
- CVE-2026-97687: urllib3 HTTPS proxy TLS settings isolationhighCVSS 4EPSS 0.2%
- CVE-2024-37891: PYSEC-2026-1995 - urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirectslowCVSS 3.1EPSS 1.1%
- CVE-2026-9375: urllib3 denial of service via Brotli decompression bomb bypasshighCVSS 7.5
- CVE-2026-44432: urllib3 resource exhaustion via improper handling of compressed datahighCVSS 7.5EPSS 0.9%
- CVE-2026-44431: urllib3 sensitive header leak in ProxyManager low-level redirectsmediumCVSS 5.3EPSS 0.3%
- CVE-2025-66471: urllib3 streaming API improper compression handlinghighCVSS 7.5EPSS 0.7%
- CVE-2021-33503: urllib3 ReDoS in URL authority parserhighCVSS 7.5EPSS 3.3%
Most severe Urllib3 vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2021-33503: urllib3 ReDoS in URL authority parserhighCVSS 7.5EPSS 3.3%
- CVE-2026-44432: urllib3 resource exhaustion via improper handling of compressed datahighCVSS 7.5EPSS 0.9%
- CVE-2025-66471: urllib3 streaming API improper compression handlinghighCVSS 7.5EPSS 0.7%
- CVE-2026-9375: urllib3 denial of service via Brotli decompression bomb bypasshighCVSS 7.5
- CVE-2026-97689: urllib3 HTTP client unbounded memory allocation in chunked transferhighCVSS 4EPSS 0.3%
- CVE-2026-97687: urllib3 HTTPS proxy TLS settings isolationhighCVSS 4EPSS 0.2%
- CVE-2026-44431: urllib3 sensitive header leak in ProxyManager low-level redirectsmediumCVSS 5.3EPSS 0.3%
- CVE-2026-97688: urllib3 infinite loop in Deflate decodermediumCVSS 4EPSS 0.3%
- CVE-2024-37891: PYSEC-2026-1995 - urllib3's Proxy-Authorization request header isn't stripped during cross-origin redirectslowCVSS 3.1EPSS 1.1%
Vulnerabilities per week
Nothing in the last four weeks, down from 3 vulnerabilities in the four before. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 0 | 0 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 3 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 0 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many Urllib3 vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/vendors/urllib3)<a href="https://junglewise.ai/threats/vendors/urllib3"><img src="https://junglewise.ai/threats/vendors/urllib3/badge.svg" alt="Urllib3 vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/vendors/urllib3.json, and this page as text at https://junglewise.ai/threats/vendors/urllib3.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "Urllib3 vulnerabilities", https://junglewise.ai/threats/vendors/urllib3, 9 November 2026.