CVE-2017-1000158

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 7.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-11-17 · updated 2026-10-08
Weakness: CWE-190

Description

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 products

Debian Linux: 7.0, 8.0, 9.0
Python: before 2.7.15; from 3.4.0 before 3.4.8; from 3.5.0 before 3.5.5 — fixed in 2.7.15, 3.4.8, 3.5.5

How to fix

Upgrade to a fixed version: Python 2.7.15, 3.4.8, 3.5.5. Check the vendor advisory for mitigations.

References

http://www.securitytracker.com/id/1039890
https://bugs.python.org/issue30657
https://lists.debian.org/debian-lts-announce/2017/11/msg00035.html
https://lists.debian.org/debian-lts-announce/2017/11/msg00036.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00030.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00031.html
https://security.gentoo.org/glsa/201805-02
https://security.netapp.com/advisory/ntap-20230216-0001/
https://www.debian.org/security/2018/dsa-4307
http://www.securitytracker.com/id/1039890
https://bugs.python.org/issue30657
https://lists.debian.org/debian-lts-announce/2017/11/msg00035.html

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