How severe is CVE-2013-7338?

CVE-2013-7338 has a CVSS 2.0 base score of 7.1, rated high severity.

Is CVE-2013-7338 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-7338?

CVE-2013-7338 primarily affects Python. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-7338?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2013-7338 published?

CVE-2013-7338 was published on 2014-04-22 and last updated on 2026-06-17.

CVE-2013-7338

CVE-2013-7338 is a high-severity vulnerability in Python with a CVSS 2.0 base score of 7.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.1)
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Python
Published: 2014-04-22
Last modified: 2026-06-17

Description

Python before 3.3.4 RC1 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a file size value larger than the size of the zip file to the (1) ZipExtFile.read, (2) ZipExtFile.read(n), (3) ZipExtFile.readlines, (4) ZipFile.extract, or (5) ZipFile.extractall function.

Frequently asked questions

What is CVE-2013-7338?: Python before 3.3.4 RC1 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a file size value larger than the size of the zip file to the (1) ZipExtFile.read, (2) ZipExtFile.read(n), (3) ZipExtFile.readlines, (4) ZipFile.extract, or (5) ZipFile.extractall function.
How severe is CVE-2013-7338?: CVE-2013-7338 has a CVSS 2.0 base score of 7.1, rated high severity.
Is CVE-2013-7338 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-7338?: CVE-2013-7338 primarily affects Python. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-7338?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2013-7338 published?: CVE-2013-7338 was published on 2014-04-22 and last updated on 2026-06-17.

References

Affected products (17)

cpe:2.3:a:python:python:3.3.0:-:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:alpha1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:alpha2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:alpha3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:alpha4:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:beta1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:beta2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:rc1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:rc2:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.0:rc3:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.1:-:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.1:rc1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.2:*:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.3:*:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.3:rc1:*:*:*:*:*:*
cpe:2.3:a:python:python:3.3.3:rc2:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*

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