---
id: CVE-2017-1000158
title: >-
  CPython (aka Python) up to 2.7.13 is vulnerable to an integer overflow in the
  PyString_DecodeEscape function in stringobject.c, resulting in heap-based
  buffer overflow (and possible arbitrary code execution)
summary: >-
  CPython (aka Python) up to 2.7.13 is vulnerable to an integer overflow in the
  PyString_DecodeEscape function in stringobject.c, resulting in heap-based
  buffer overflow (and possible arbitrary code execution)
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-190
vendor: python
product: python
affected:
  - python < 2.7.15
  - 'python >= 3.4.0, < 3.4.8'
  - 'python >= 3.5.0, < 3.5.5'
  - debian_linux = 7.0
  - debian_linux = 8.0
  - debian_linux = 9.0
patched:
  - python 3.5.5
published: '2017-11-17'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:17:05.670'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2017-1000158'
references:
  - url: 'http://www.securitytracker.com/id/1039890'
    label: cve@mitre.org
  - url: 'https://bugs.python.org/issue30657'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2017/11/msg00035.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2017/11/msg00036.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2018/09/msg00030.html'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2018/09/msg00031.html'
    label: cve@mitre.org
  - url: 'https://security.gentoo.org/glsa/201805-02'
    label: cve@mitre.org
  - url: 'https://security.netapp.com/advisory/ntap-20230216-0001/'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2018/dsa-4307'
    label: cve@mitre.org
  - url: 'http://www.securitytracker.com/id/1039890'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugs.python.org/issue30657'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2017/11/msg00035.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2017/11/msg00036.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2018/09/msg00030.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2018/09/msg00031.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.gentoo.org/glsa/201805-02'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://security.netapp.com/advisory/ntap-20230216-0001/'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2018/dsa-4307'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.07944
epssPercentile: 0.94595
ingestedAt: '2026-10-08T22:11:53.692Z'
---

## Overview

CPython (aka Python) up to 2.7.13 is vulnerable to an integer overflow in the PyString_DecodeEscape function in stringobject.c, resulting in heap-based buffer overflow (and possible arbitrary code execution)

## Affected

- `python < 2.7.15`
- `python >= 3.4.0, < 3.4.8`
- `python >= 3.5.0, < 3.5.5`
- `debian_linux = 7.0`
- `debian_linux = 8.0`
- `debian_linux = 9.0`

## Remediation

Upgrade past the affected range:

- `python 3.5.5`