The Wave_read._read_fmt_chunk function in Lib/wave.py in Python through 3.6.4 does not ensure a nonzero channel value, which allows attacke…

published 2018-03-01 8 y ago modified 2026-06-17 4 mo ago also EUVD-2017-9340

cvss: 6.5; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.3%; EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits: 0; none known

The Wave_read._read_fmt_chunk function in Lib/wave.py in Python through 3.6.4 does not ensure a nonzero channel value, which allows attackers to cause a denial of service (divide-by-zero and exception) via a crafted wav format audio file. NOTE: the vendor disputes this issue because Python applications "need to be prepared to handle a wide variety of exceptions.

Patch / fix

distros 3

suse opensuse azure linux

python36 SLES for SAP 12 SP5, SLES 12 SP5 3.6.10-4.3.5
python36-base SLES for SAP 12 SP5, SLES 12 SP5 3.6.10-4.3.5
python SLE Module for Python 2 15 SP1, SLE Module for Desktop Applications 15 SP1, SLE Module for Desktop Applications 15 +2 more 2.7.17-7.32.2
python-base SLE Module for Python 2 15 SP1, SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 2.7.17-7.32.1
python3 SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 3.6.10-3.42.2
python3-base SLE Module for Development Tools 15 SP1, SLE Module for Development Tools 15, SLE Module for Basesystem 15 SP1 +1 more 3.6.10-3.42.2
python SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +1 more 2.7.13-28.6.1
python-base SLES for SAP 12 SP3, SLES 12 SP3, SLED 12 SP3 +2 more 2.7.13-28.6.1

suse advisories SUSE-SU-2020:0302-1 SUSE-SU-2020:0234-1 SUSE-SU-2019:14246-1 SUSE-SU-2020:0114-1 SUSE-SU-2018:2040-1 SUSE-SU-2018:1786-1

python openSUSE Tumbleweed 2.7.18-8.1
python36 openSUSE Tumbleweed 3.6.15-1.1
python3 openSUSE Leap 15.1 3.6.10-lp151.6.7.1
python3-base openSUSE Leap 15.1 3.6.10-lp151.6.7.1

opensuse advisories openSUSE-SU-2024:11202-1 openSUSE-SU-2024:11284-1 openSUSE-SU-2020:0086-1

python2 CBL-Mariner 2.0 2.7.18-8

azure linux advisories AZL-6824

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Exploit prediction

1.32% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.0	6.5	CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-369 Divide By Zero

References

lists.opensuse.org /opensuse-security-announce/2020-01/msg00040.html
vendor-advisory
bugs.python.org /issue32056
issue-tracking, vendor-advisory

Sources

CVE List CVE-2017-18207
NVD CVE-2017-18207

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary