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Fencer Vulns
critical 9.8

CVE-2018-16428 json

In GNOME GLib 2.56.1, g_markup_parse_context_end_parse() in gmarkup.c has a NULL pointer dereference.

published 2018-09-04 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-8268

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.7%
EPSS 4.7% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

In GNOME GLib 2.56.1, g_markup_parse_context_end_parse() in gmarkup.c has a NULL pointer dereference.

Patch / fix

  • glib2.0 Debian 14, Debian 13, Debian 12 2.58.0-1

debian advisories DEBIAN-CVE-2018-16428

  • glib2.0 Ubuntu 14.04 LTS 2.40.2-0ubuntu1.1
  • glib2.0 Ubuntu 16.04 LTS 2.48.2-0ubuntu4.1
  • glib2.0 Ubuntu 18.04 LTS 2.56.2-0ubuntu0.18.04.2

ubuntu advisories UBUNTU-CVE-2018-16428

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • glib2 SLES for SAP 12 SP4, SLES for SAP 12 SP3, SLES for SAP 12 SP2 +12 more 2.48.2-12.12.2
  • glib2 SLE Module for Package Hub 15, SLE Module for Basesystem 15 2.54.3-4.7.1
  • glib2 SLES 12-LTSS, SLES 12 SP1-LTSS 2.38.2-7.9.2

suse advisories SUSE-SU-2019:1722-1SUSE-SU-2019:1596-1SUSE-SU-2018:3913-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-16428 updated cvss 9.8

glib2: NULL pointer dereference in g_markup_parse_context_end_parse() function in gmarkup.c

  • Red Hat Enterprise Linux 5 glib2, firefox Red Hat Enterprise Linux 6 glib2, firefox, thunderbird Red Hat Enterprise Linux 7 firefox, thunderbird
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 glib2, glib2-fam, glib2-tests Red Hat Enterprise Linux 8 glib2, firefox, glib2-fam, glib2-tests, thunderbird
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

4.69% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/glib/issues/1364 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.