What is CVE-2019-18837?

CVE-2019-18837 is a high-severity vulnerability in Crun, classified under Improper Link Resolution Before File Access. CVSS score: 8.6/10. Published 2019-11-13.

How severe is CVE-2019-18837?

High severity. CVSS v3 base score is 8.6 out of 10.

Vulnerability in Crun

CVE-2019-18837

An issue was discovered in crun before 0.10.5. With a crafted image, it doesn't correctly check whether a target is a symlink, resulting in access to files outside of the container. This occurs in libcrun/linux.c and libcrun/chroot_realpath.c.

Published 2019-11-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.014 (72.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 72.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Crun — versions before 0.10.5
Crun Project
Fedoraproject Fedora — versions 30, 31

Weakness classification (CWE)

CWE-59 — Improper Link Resolution Before File Access

References

Frequently asked questions

What is CVE-2019-18837?: CVE-2019-18837 is a high-severity vulnerability in Crun, classified under Improper Link Resolution Before File Access. CVSS score: 8.6/10. Published 2019-11-13.
How severe is CVE-2019-18837?: High severity. CVSS v3 base score is 8.6 out of 10.