CVE-2017-18361 Pylons Colander Denial of Service vulnerability
An attacker can cause a denial of service in the Pylons Colander library by submitting a URL with an unclosed parenthesis, triggering an infinite loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2017-18361?
CVE-2017-18361 is a high-severity denial of service vulnerability in n/a, published on 1 Feb 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Pylons Colander through 1.6, the URL validator allows an attacker to potentially cause an infinite loop thereby causing a denial of service via an unclosed parenthesis.
Weakness: CWE-835
Which versions are affected by CVE-2017-18361?
3 open source packages ship an affected version, including colander. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
colander PyPI | All versions | 1.7.0 |
colander PyPI | All versions | 1.7.0 |
colander PyPI | All versions | 1.7.0 |
Linux distribution packages (2)
python-colander openSUSE:Tumbleweed | All versions | 2.0-1.3 |
python-colander openSUSE:Tumbleweed | All versions | 2.0-2.4 |
Products include Pylonsproject Colander.
How do I fix CVE-2017-18361?
Upgrade colander to 1.7.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-18361 being exploited?
There is no known exploitation of CVE-2017-18361 in the wild and no public exploit code.
Sources
Also known as GHSA-rv95-4wxj-6fqq, PYSEC-2019-167, UBUNTU-CVE-2017-18361, openSUSE-SU-2024:11222-1, openSUSE-SU-2024:14136-1, openSUSE-SU-2026:12004-1.