What is CVE-2017-18361?

CVE-2017-18361 is a high-severity vulnerability in Pylonsproject Colander, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2019-02-01.

How severe is CVE-2017-18361?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Pylonsproject Colander

CVE-2017-18361

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.

Published 2019-02-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.4th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Pylonsproject Colander

Weakness classification (CWE)

CWE-835 — Loop with Unreachable Exit Condition (Infinite Loop)

References

github.com/Pylons/colander/pull/323 (Patch, Third Party Advisory)
github.com/Pylons/colander/issues/290 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2017-18361?: CVE-2017-18361 is a high-severity vulnerability in Pylonsproject Colander, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2019-02-01.
How severe is CVE-2017-18361?: High severity. CVSS v3 base score is 7.5 out of 10.