Disclosure summary
Python 2.7.14 is vulnerable to a Heap-Buffer-Overflow as well as a Heap-Use-After-Free. Python versions prior to 2.7.14 may also be vulnerable and it appears that Python 2.7.17 and prior may also be vulnerable however this has not been confirmed. The vulnerability lies when multiply threads are handling large amounts of data. In both cases there is essentially a race condition that occurs. For the Heap-Buffer-Overflow, Thread 2 is creating the size for a buffer, but Thread1 is already writing to the buffer without knowing how much to write. So when a large amount of data is being processed, it is very easy to cause memory corruption using a Heap-Buffer-Overflow. As for the Use-After-Free, Thread3->Malloc->Thread1->Free's->Thread2-Re-uses-Free'd Memory. The PSRT has stated that this is not a security vulnerability due to the fact that the attacker must be able to run code, however in some situations, such as function as a service, this vulnerability can potentially be used by an attacker to violate a trust boundary, as such the DWF feels this issue deserves a CVE.
Source-reported weakness categories
CWE-416, CWE-787
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2018-1000030
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| python | python | * {"versionEndIncluding":"2.7.14"} |
| canonical | ubuntu_linux | 12.04 |
| canonical | ubuntu_linux | 14.04 |
| canonical | ubuntu_linux | 16.04 |
| canonical | ubuntu_linux | 18.04 |
Original records & references
- NIST NVD record
- CVE Program record
- bugs.python.org — Issue Tracking, Patch, Vendor Advisory
- drive.google.com — Third Party Advisory
- security.gentoo.org — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- www.dropbox.com — Permissions Required
- www.oracle.com — Third Party Advisory
- bugs.python.org — Issue Tracking, Patch, Vendor Advisory
- drive.google.com — Third Party Advisory
- security.gentoo.org — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- usn.ubuntu.com — Third Party Advisory
- www.dropbox.com — Permissions Required
- www.oracle.com — Third Party Advisory
PUBLISHED 2018-02-08T12:29:00-05:00
MODIFIED 2026-10-08T17:17:06-04:00
INGESTED 2026-10-10T20:50:18-04:00