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Vulnerability record · CVE-2016-5636 · published 2 September 2016

CVE-2016-5636: Python integer overflow vulnerability

Python · Python

Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 allows remote attackers to have unspecified impact via a negative data size value, which triggers a heap-based buffer overflow.

9.8 CVSS 3.0 Critical EPSS 25% · top 2.1% CWE-190 · Integer overflow
9.8CVSS 3.0 base score, v2 10.0
25%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
30References
17 Jun 2026Last modified by NVD

Description

Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 allows remote attackers to have unspecified impact via a negative data size value, which triggers a heap-based buffer overflow.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://rhn.redhat.com/errata/RHSA-2016-2586.html
http://www.openwall.com/lists/oss-security/2016/06/15/15 Mailing List
http://www.openwall.com/lists/oss-security/2016/06/16/1 Mailing List
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
http://www.securityfocus.com/bid/91247
http://www.securitytracker.com/id/1038138
http://www.splunk.com/view/SP-CAAAPSV
http://www.splunk.com/view/SP-CAAAPUE
https://bugs.python.org/issue26171 Issue TrackingPatch
https://docs.python.org/3.4/whatsnew/changelog.html#python-3-4-5 Release Notes
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-2 Release Notes
https://hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS Release Notes
https://lists.debian.org/debian-lts-announce/2019/02/msg00011.html
https://security.gentoo.org/glsa/201701-18
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
http://rhn.redhat.com/errata/RHSA-2016-2586.html
http://www.openwall.com/lists/oss-security/2016/06/15/15 Mailing List
http://www.openwall.com/lists/oss-security/2016/06/16/1 Mailing List
http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
http://www.securityfocus.com/bid/91247
http://www.securitytracker.com/id/1038138
http://www.splunk.com/view/SP-CAAAPSV
http://www.splunk.com/view/SP-CAAAPUE
https://bugs.python.org/issue26171 Issue TrackingPatch
https://docs.python.org/3.4/whatsnew/changelog.html#python-3-4-5 Release Notes
https://docs.python.org/3.5/whatsnew/changelog.html#python-3-5-2 Release Notes
https://hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS Release Notes
https://lists.debian.org/debian-lts-announce/2019/02/msg00011.html
https://security.gentoo.org/glsa/201701-18

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Source: NIST National Vulnerability Database (record CVE-2016-5636), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.