Bug 2418078 (CVE-2025-13836) - CVE-2025-13836 cpython: Excessive read buffering DoS in http.client
Summary: CVE-2025-13836 cpython: Excessive read buffering DoS in http.client
Keywords:
Status: NEW
Alias: CVE-2025-13836
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
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Depends On: 2428927 2428929 2428930 2428931 2428932 2428933 2428939 2428940 2428941 2428942 2428943 2428928 2428934 2428935 2428936 2428937 2428938 2428944 2428945 2428946 2428947 2428948
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-12-01 19:01 UTC by OSIDB Bzimport
Modified: 2026-01-13 12:42 UTC (History)
18 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2025-12-01 19:01:30 UTC 
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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