vulnerability
Ubuntu: USN-7951-1 (CVE-2025-13836): Python vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 8 | (AV:N/AC:L/Au:N/C:N/I:N/A:C) | Dec 1, 2025 | Jan 13, 2026 | Feb 11, 2026 |
Severity
8
CVSS
(AV:N/AC:L/Au:N/C:N/I:N/A:C)
Published
Dec 1, 2025
Added
Jan 13, 2026
Modified
Feb 11, 2026
Description
It was discovered that Python's http.client did not properly handle the
Content-Length header in HTTP responses. A malicious server could exploit
this to cause Python to allocate excessive memory, leading to a denial of
service.
Solutions
ubuntu-pro-upgrade-libpython3-10ubuntu-pro-upgrade-libpython3-11ubuntu-pro-upgrade-libpython3-12t64ubuntu-pro-upgrade-libpython3-13ubuntu-pro-upgrade-libpython3-14ubuntu-pro-upgrade-libpython3-8ubuntu-pro-upgrade-libpython3-9ubuntu-pro-upgrade-python3-10ubuntu-pro-upgrade-python3-11ubuntu-pro-upgrade-python3-12ubuntu-pro-upgrade-python3-13ubuntu-pro-upgrade-python3-14ubuntu-pro-upgrade-python3-8ubuntu-pro-upgrade-python3-9
References
- CVE-2025-13836
- https://attackerkb.com/topics/CVE-2025-13836
- CWE-400
- UBUNTU-USN-7951-1
- URL-https://github.com/python/cpython/commit/4ce27904b597c77d74dd93f2c912676021a99155
- URL-https://github.com/python/cpython/commit/5a4c4a033a4a54481be6870aa1896fad732555b5
- URL-https://github.com/python/cpython/issues/119451
- URL-https://github.com/python/cpython/pull/119454
- URL-https://ubuntu.com/security/notices/USN-7951-1
- URL-https://www.cve.org/CVERecord?id=CVE-2025-13836
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