High 7.1Published Apr 22, 2014

CVE-2013-7338Python 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,…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 7.1 HIGH (v2.0, NVD)AV:N/AC:M/Au:N/C:N/I:N/A:C
Weakness (CWE): CWE-20
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: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

python python python:python	3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; 3.3.0; and 8 more ranges	NVD
apple mac_os_x apple:mac_os_x	through 10.10.4	NVD

References

References

http://bugs.python.org/issue20078	exploit, patch, vendor-advisory
http://hg.python.org/cpython/rev/79ea4ce431b1	exploit, patch, vendor-advisory
http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html	mailing-list
http://lists.opensuse.org/opensuse-updates/2014-05/msg00008.html	mailing-list, third-party-advisory
http://seclists.org/oss-sec/2014/q1/592	mailing-list, third-party-advisory
http://seclists.org/oss-sec/2014/q1/595	mailing-list, third-party-advisory
http://www.securityfocus.com/bid/65179	third-party-advisory, vdb-entry
http://www.securitytracker.com/id/1029973	third-party-advisory, vdb-entry
https://docs.python.org/3.3/whatsnew/changelog.html	vendor-advisory
https://security.gentoo.org/glsa/201503-10	third-party-advisory
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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.