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CVE-2016-5636

34
FAUCET Score

CVE-2016-5636 is an integer overflow vulnerability in the get_data function within CPython (Python) versions before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2. This flaw allows remote attackers to trigger a heap-based buffer overflow by providing a negative data size value, leading to a critical impact on confidentiality, integrity, and availability. With a CVSS score of 9.8, it is easily exploitable over the network with low attack complexity and no user interaction required. Despite its high severity and potential for remote code execution, there is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
3.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.0:*:*:*:*:*:*:*
3.0.1CPE matchmatch criteria
cpe:2.3:a:python:python:3.0.1:*:*:*:*:*:*:*
3.1.0CPE matchmatch criteria
cpe:2.3:a:python:python:3.1.0:*:*:*:*:*:*:*
3.1.1CPE matchmatch criteria
cpe:2.3:a:python:python:3.1.1:*:*:*:*:*:*:*
3.1.2CPE matchmatch criteria
cpe:2.3:a:python:python:3.1.2:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
21.37%
Probability of exploitation in next 30 days
EPSS Percentile
97.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.2137 is in the 94th percentile among its peer group of 36,862 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: python-0:2.7.5-48.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: python
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: python
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: python27-python
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: python33-python
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-python34-python
redhatend of lifevia redhat_api
Product: Red Hat Software CollectionsFixed in: rh-python35-python

Vendor Advisories (1)

redhatCVE-2016-5636Low

python: Heap overflow in zipimporter module

Jan 21, 2016

References

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