What is CVE-2017-18186?

CVE-2017-18186 is a medium-severity vulnerability in Qpdf Project, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2018-02-13.

How severe is CVE-2017-18186?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Qpdf Project

CVE-2017-18186

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Published 2018-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 65th percentile — 64.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Qpdf Project

Weakness classification (CWE)

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

References

usn.ubuntu.com/3638-1/ (vendor-advisory)
github.com/qpdf/qpdf/commit/85f05cc57ffa0a863d9d9b23e73acea9410b2937 (Third Party Advisory)
github.com/qpdf/qpdf/issues/149 (Third Party Advisory)

Frequently asked questions

What is CVE-2017-18186?: CVE-2017-18186 is a medium-severity vulnerability in Qpdf Project, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2018-02-13.
How severe is CVE-2017-18186?: Medium severity. CVSS v3 base score is 5.5 out of 10.