High 7.5Published Dec 1, 2025

CVE-2025-13836When reading an HTTP response from a server, if no read amount is specified, the default behavior will be to use Content-Length.

Updated under an hour ago (2026-10-19 08:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Sep 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

python python python:python	before 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; 3.14.0; 3.15.0; 3.15.0	NVD

References

https://github.com/python/cpython/commit/14b1fdb0a94b96f86fc7b86671ea9582b8676628patch
https://github.com/python/cpython/commit/289f29b0fe38baf2d7cb5854f4bb573cc34a6a15patch
https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155patch
https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5patch
https://github.com/python/cpython/commit/5dc101675fd22918facbbe0fecdc821502beaaf0patch
https://github.com/python/cpython/commit/afc40bdd3dd71f343fd9016f6d8eebbacbd6587cpatch
https://github.com/python/cpython/issues/119451issue-tracking, patch
https://github.com/python/cpython/pull/119454issue-tracking, patch
https://mail.python.org/archives/list/security-announce@python.org/thread/OQ6G7MKRQIS3OAREC3HNG3D2DPOU34XO/vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.