SARA / Free Tools / CVE / CVE-2023-45803

CVE-2023-45803 — urllib3 is a user-friendly HTTP client library for Python

urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like `POST`) t

CVSS
4.2 MEDIUM
EPSS
0.05% (top 84.40%)
CWE
CWE-200
Published
2023-10-17T19:43:45.404Z
Last modified
2025-11-03T21:49:53.115Z
CVSS vector
CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N

01What is this vulnerability?

urllib3 is a user-friendly HTTP client library for Python. urllib3 previously wouldn't remove the HTTP request body when an HTTP redirect response using status 301, 302, or 303 after the request had its method changed from one that could accept a request body (like `POST`) to `GET` as is required by HTTP RFCs. Although this behavior is not specified in the section for redirects, it can be…

02Affected products

VendorProductVersions
urllib3urllib3>= 2.0.0, < 2.0.7, < 1.26.18

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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