What is CVE-2018-7731?

CVE-2018-7731 is a medium-severity vulnerability in Exempi Project, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-03-06.

How severe is CVE-2018-7731?

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

NULL pointer dereference in Exempi Project

CVE-2018-7731

An issue was discovered in Exempi through 2.4.4. XMPFiles/source/FormatSupport/WEBP_Support.cpp does not check whether a bitstream has a NULL value, leading to a NULL pointer dereference in the WEBP::VP8XChunk class.

Published 2018-03-06 · 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: 0.012 (67.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Exempi Project
Canonical Ubuntu Linux — versions 14.04, 16.04, 17.10

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

cgit.freedesktop.org/exempi/commit/ (Patch, Third Party Advisory)
usn.ubuntu.com/3668-1/ (vendor-advisory, Third Party Advisory)
bugs.freedesktop.org/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)
lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)

Frequently asked questions

What is CVE-2018-7731?: CVE-2018-7731 is a medium-severity vulnerability in Exempi Project, classified under NULL Pointer Dereference. CVSS score: 5.5/10. Published 2018-03-06.
How severe is CVE-2018-7731?: Medium severity. CVSS v3 base score is 5.5 out of 10.