What is CVE-2018-19757?

CVE-2018-19757 is a medium-severity vulnerability in Saitoha Libsixel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-11-30.

How severe is CVE-2018-19757?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Saitoha Libsixel

CVE-2018-19757

There is a NULL pointer dereference at function sixel_helper_set_additional_message (status.c) in libsixel 1.8.2 that will cause a denial of service.

Published 2018-11-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (56.8th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 57th percentile — 56.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000

Affected products

Saitoha Libsixel — versions 1.8.2

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

bugzilla.redhat.com/show_bug.cgi (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2018-19757?: CVE-2018-19757 is a medium-severity vulnerability in Saitoha Libsixel, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2018-11-30.
How severe is CVE-2018-19757?: Medium severity. CVSS v3 base score is 6.5 out of 10.