Allocation of Resources Without Limits or Throttling Affecting cpython package, versions [3.8.12,3.9.7)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published3 Dec 2025
- disclosed1 Dec 2025
- creditUnknown
Introduced: 1 Dec 2025
CVE-2025-13836 (opens in a new tab)How to fix?
Upgrade cpython to version 3.9.7 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the http.client.HTTPResponse.read() function when used without arguments. An attacker can exhaust system memory and potentially cause application or system instability by sending a crafted HTTP response with a very large or manipulated Content-Length header to a client that reads the response without specifying a byte limit.
Note:
This is only exploitable if the application connects to a malicious or compromised server and does not set an explicit read size when using the read() function.
Workaround
This vulnerability can be mitigated by always specifying a safe, explicit byte limit when reading data using the read() function.