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Fencer Vulns
critical 9.8

CVE-2018-18493 json

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the us…

published 2019-02-28 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10218

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
5.0%
EPSS 5.0% chance of exploitation in 30 days, percentile 92%
public exploits
0
none known

Summary

A buffer overflow can occur in the Skia library during buffer offset calculations with hardware accelerated canvas 2D actions due to the use of 32-bit calculations instead of 64-bit. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.

Patch / fix

  • Mozilla Thunderbird 60.4
  • Mozilla Firefox ESR 60.4
  • Mozilla Firefox 64
  • firefox-esr Debian 14, Debian 13, Debian 12 60.4.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:60.4.0-1

debian advisories DEBIAN-CVE-2018-18493

  • firefox Ubuntu 14.04 LTS 64.0+build3-0ubuntu0.14.04.1
  • firefox Ubuntu 16.04 LTS 64.0+build3-0ubuntu0.16.04.1
  • firefox Ubuntu 18.04 LTS 64.0+build3-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:60.4.0+build2-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:60.4.0+build2-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:60.4.0+build2-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-18493

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

  • thunderbird RHEL 6 60.4.0-1.el6
  • thunderbird RHEL 7 60.4.0-1.el7_6
  • firefox RHEL 7 60.4.0-1.el7
  • firefox RHEL 6 60.4.0-1.el6

red hat advisories RHSA-2019:0159RHSA-2019:0160RHSA-2018:3833RHSA-2018:3831

  • mozilla-nss SLES 12 SP4, SLES 12 SP3, SLES 12 SP2-BCL +13 more 3.40.1-58.18.1
  • mozilla-nspr SLES 12 SP4, SLES 12 SP3, SLES 12 SP2-BCL +13 more 4.20-19.6.1
  • MozillaFirefox SLES 12 SP4, SLES 12 SP3, SLES 12 SP2-BCL +13 more 60.4.0esr-109.55.1
  • MozillaThunderbird SLE Workstation Extension 15 60.5.0-3.20.2
  • mozilla-nss SLE Module for Basesystem 15 3.40.1-3.7.2
  • mozilla-nspr SLE Module for Basesystem 15 4.20-3.3.2
  • MozillaFirefox SLE Module for Desktop Applications 15 60.4.0-3.21.1

suse advisories SUSE-SU-2018:4236-2SUSE-SU-2019:0338-1SUSE-SU-2018:4236-1SUSE-SU-2018:4235-1

  • firefox-esr openSUSE Tumbleweed 128.5.1-1.1
  • MozillaFirefox openSUSE Tumbleweed 92.0-1.2
  • MozillaThunderbird openSUSE Tumbleweed 91.1.1-1.1
  • MozillaThunderbird Package Hub 12 60.5.1-79.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2019:0249-1

  • firefox Arch Linux 64.0-1

arch linux advisories AVG-833

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-2018-18493 updated cvss 9.8

Mozilla: Buffer overflow in accelerated 2D canvas with Skia

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.4.0-1.el7, thunderbird 60.4.0-1.el7_6 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.4.0-1.el7
    fixed: vendor fix RHSA-2018:3833
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.4.0-1.el6, thunderbird 60.4.0-1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.4.0-1.el6
    fixed: vendor fix RHSA-2018:3831
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.4.0-1.el7
    fixed: vendor fix RHSA-2018:3833
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 60.4.0-1.el7_6
    fixed: vendor fix RHSA-2019:0160
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.4.0-1.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.4.0-1.el6
    fixed: vendor fix RHSA-2018:3831
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.4.0-1.el7
    fixed: vendor fix RHSA-2018:3833
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.4.0-1.el6, thunderbird 60.4.0-1.el6
    fixed: vendor fix RHSA-2018:3831
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.4.0-1.el7, thunderbird 60.4.0-1.el7_6
    fixed: vendor fix RHSA-2018:3833
show 5 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.4.0-1.el6, thunderbird 60.4.0-1.el6
    fixed: vendor fix RHSA-2018:3831
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.4.0-1.el7, thunderbird 60.4.0-1.el7_6
    fixed: vendor fix RHSA-2018:3833
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.4.0-1.el6
    fixed: vendor fix RHSA-2018:3831
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.4.0-1.el7
    fixed: vendor fix RHSA-2018:3833
  • Red Hat Enterprise Linux 8 firefox, 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

4.98% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).

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

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

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.