CVE Database›CVE-2019-9674

CVE-2019-9674

python: Nested zip file (Zip bomb) vulnerability in Lib/zipfile.py

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Severity

Low

Red Hat Product Security

4.2

CVSS 3.1

Review impact separately from score.

Published · March 11, 2019

Updated · November 22, 2025

Description

A ZIP bomb attack was found in the Python zipfile module. A remote attacker could abuse this flaw by providing a specially crafted ZIP file that, when decompressed by zipfile, would exhaust system resources resulting in a denial of service.

Statement

There is no plan to fix this flaw. Programs using the Python zipfile module should be responsible for validating external untrusted ZIP files. For further details, please refer to the following URLs:

[1] https://docs.python.org/dev/library/zipfile.html#decompression-pitfalls

[2] https://python-security.readthedocs.io/security.html#archives-and-zip-bomb

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.2
CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:H

CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification)