Integer overflow in Python
CVE-2016-5636
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.255 (97.9th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 97.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.255 · newest: 0.255 · change: 0.000
Affected products
- Python — versions 3.0, 3.0.1, 3.1.0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.splunk.com/view/SP-CAAAPUE
- www.openwall.com/lists/oss-security/2016/06/16/1 (mailing-list, Mailing List)
- www.splunk.com/view/SP-CAAAPSV
- lists.debian.org/debian-lts-announce/2019/02/msg00011.html (mailing-list)
- docs.python.org/3.4/whatsnew/changelog.html (Release Notes)
- www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- bugs.python.org/issue26171 (Patch, Issue Tracking)
- hg.python.org/cpython/raw-file/v2.7.12/Misc/NEWS (Release Notes)
- www.securitytracker.com/id/1038138 (vdb-entry)
- www.securityfocus.com/bid/91247 (vdb-entry)
Frequently asked questions
- What is CVE-2016-5636?
- CVE-2016-5636 is a critical-severity vulnerability in Python, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2016-09-02.
- How severe is CVE-2016-5636?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2016-5636 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.