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Urllib3

22 CVEs tracked. None of them is in CISA KEV.

This hub aggregates every CVE we track for Urllib3, a product in the oss libraries space. Use it to gauge the current risk picture and drill into individual advisories.

Urllib3 CVEs per month

Dec 2024 to Nov 2026. Point at a month, or focus the strip and use the arrow keys.
Urllib3 CVEs per month
MonthCVEs
2024-120
2025-010
2025-020
2025-030
2025-040
2025-050
2025-062
2025-070
2025-080
2025-090
2025-100
2025-110
2025-122
2026-011
2026-020
2026-030
2026-040
2026-052
2026-060
2026-070
2026-080
2026-093
2026-100
2026-110

Severity

How the 22 CVEs score on CVSS. Severity is not exploitation: KEV is counted above.

  • Critical15%
  • High941%
  • Medium1150%
  • Low15%

Latest CVEs

The 15 most recently published vulnerabilities affecting Urllib3.

  1. CVE-2026-97689urllib3: HTTPResponse.stream()/read_chunked() buffers an unbounded chunk-size line into memory7.5
  2. CVE-2026-97688urllib3: Chunked Deflate streaming can enter an infinite loop5.3
  3. CVE-2026-97687urllib3: HTTPS proxy TLS configuration may be ignored or overridden8.1
  4. CVE-2026-44431urllib3: Sensitive headers forwarded across origins in proxied low-level redirects5.3
  5. CVE-2026-44432urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API7.5
  6. CVE-2026-21441urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)7.5
  7. CVE-2025-66471urllib3 Streaming API improperly handles highly compressed data7.5
  8. CVE-2025-66418urllib3 allows an unbounded number of links in the decompression chain7.5
  9. CVE-2025-50182urllib3 does not control redirects in browsers and Node.js5.3
  10. CVE-2025-50181urllib3 redirects are not disabled when retries are disabled on PoolManager instantiation5.3
  11. CVE-2024-37891Proxy-Authorization request header isn't stripped during cross-origin redirects in urllib34.4
  12. CVE-2023-45803Request body not stripped after redirect in urllib34.2
  13. CVE-2018-25091urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials i...6.1
  14. CVE-2023-43804`Cookie` HTTP header isn't stripped on cross-origin redirects5.9
  15. CVE-2021-33503An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracki...7.5

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