CVE-2025-13836: Excessive read buffering DoS in http.client
Python Software Foundation · CPython
Vendor fix available · Affected: Python Software Foundation CPython · Exploitation: possible (1 to 10%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 78% of scored CVEs
DescriptionCVE.org
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.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- Python Software Foundation · CPythonbefore 3.10.20; from 3.11.0 before 3.11.15; from 3.12.0 before 3.12.13; from 3.13.0 before 3.13.11; from 3.14.0 before 3.14.1; from 3.15.0a1 before 3.15.0a3
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Possible (1 to 10%). EPSS between 1% and 10%.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Published
- December 2025
CoverageNo articles yet
No CyberSIXT article names CVE-2025-13836 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.