CVE-2025-13836: python DoS — Fix

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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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
python	python	< 3.13.11
python	python	All
python	python	All
python	python	All

References

Advisories & Patches

Frequently Asked Questions

What is CVE-2025-13836? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-13836? +

CVE-2025-13836 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-13836? +

CVE-2025-13836 affects products from python, specifically: python. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-13836? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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