When decompressing crafted zip files using the bzip/LZMA/Zstandard

compressions, Python could use an attacker-controlled size to

pre-allocate memory, possibly resulting in memory exhaustion.

Project Subscriptions

Vendors Products
Cpython Subscribe
Advisories
Source ID Title
Debian DLA Debian DLA DLA-4827-1 python3.11 security update
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 01 Oct 2026 01:15:00 +0000


Wed, 30 Sep 2026 21:15:00 +0000


Wed, 30 Sep 2026 01:30:00 +0000


Thu, 17 Sep 2026 00:45:00 +0000


Wed, 16 Sep 2026 01:00:00 +0000


Fri, 11 Sep 2026 01:15:00 +0000


Fri, 04 Sep 2026 01:15:00 +0000


Tue, 01 Sep 2026 01:30:00 +0000


Wed, 26 Aug 2026 00:30:00 +0000


Tue, 25 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 25 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
First Time appeared Python
Python cpython
Vendors & Products Python
Python cpython

Tue, 25 Aug 2026 15:15:00 +0000

Type Values Removed Values Added
Description When decompressing crafted zip files using the bzip/LZMA/Zstandard compressions, Python could use an attacker-controlled size to pre-allocate memory, possibly resulting in memory exhaustion.
Title zipfile: bzip2/LZMA/Zstandard members decompress without a max_length bound, defeating chunked-read memory limits
Weaknesses CWE-400
References
Metrics cvssV4_0

{'score': 2.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: PSF

Published:

Updated: 2026-10-02T00:39:36.038Z

Reserved: 2026-07-09T17:39:12.652Z

Link: CVE-2026-15310

cve-icon Vulnrichment

Updated: 2026-08-25T17:39:17.557Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-25T15:16:30.027

Modified: 2026-10-02T01:16:43.337

Link: CVE-2026-15310

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-25T17:15:05Z

Weaknesses