CVE-2025-13836
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-12-01

Last updated on: 2026-05-18

Assigner: Python Software Foundation

Description
When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length. This allows a malicious server to cause the client to read large amounts of data into memory, potentially causing OOM or other DoS.
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Meta Information
Published
2025-12-01
Last Modified
2026-05-18
Generated
2026-06-16
AI Q&A
2025-12-01
EPSS Evaluated
2026-06-15
NVD
CVE-2025-13836
Affected Vendors & Products
Showing 7 associated CPEs
Vendor Product Version / Range
python python 3.15.0
python python 3.15.0
python python 3.14.0
python python to 3.10.20 (exc)
python python From 3.11.0 (inc) to 3.11.15 (exc)
python python From 3.12.0 (inc) to 3.12.13 (exc)
python python From 3.13.0 (inc) to 3.13.11 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability occurs when reading an HTTP response from a server without specifying a read amount. The default behavior uses the Content-Length header, which a malicious server can exploit to cause the client to read excessively large amounts of data into memory. This can lead to out-of-memory (OOM) conditions or other denial-of-service (DoS) effects.

Impact Analysis

The vulnerability can cause your client application to consume excessive memory by reading large amounts of data, potentially leading to out-of-memory errors or denial-of-service conditions that disrupt normal operation.

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