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Fencer Vulns
medium 6.5

CVE-2018-12366 json

An invalid grid size during QCMS (color profile) transformations can result in the out-of-bounds read interpreted as a float value.

published 2018-10-18 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-4340

cvss
6.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.2%
EPSS 3.2% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

An invalid grid size during QCMS (color profile) transformations can result in the out-of-bounds read interpreted as a float value. This could leak private data into the output. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Patch / fix

  • Mozilla Thunderbird 52.9, 60
  • Mozilla Firefox ESR 52.9, 60.1
  • Mozilla Firefox 61
  • firefox-esr Debian 14, Debian 13, Debian 12 52.9.0esr-1
  • thunderbird Debian 14, Debian 13, Debian 12 1:52.9.0-1

debian advisories DEBIAN-CVE-2018-12366

  • firefox Ubuntu 14.04 LTS 61.0+build3-0ubuntu0.14.04.2
  • firefox Ubuntu 16.04 LTS 61.0+build3-0ubuntu0.16.04.2
  • firefox Ubuntu 18.04 LTS 61.0+build3-0ubuntu0.18.04.1
  • thunderbird Ubuntu 14.04 LTS 1:52.9.1+build3-0ubuntu0.14.04.1
  • thunderbird Ubuntu 16.04 LTS 1:52.9.1+build3-0ubuntu0.16.04.1
  • thunderbird Ubuntu 18.04 LTS 1:52.9.1+build3-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-12366

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 7 52.9.1-1.el7_5
  • thunderbird RHEL 6 52.9.1-1.el6
  • firefox RHEL 6 60.1.0-5.el6
  • firefox RHEL 7 60.1.0-4.el7_5

red hat advisories RHSA-2018:2252RHSA-2018:2251RHSA-2018:2112RHSA-2018:2113

  • MozillaThunderbird SLE Workstation Extension 15 60.2.1-3.13.1
  • MozillaFirefox SLES 12 SP3, SLES 12 SP2-BCL, SLED 12 SP3 +9 more 52.9.0esr-109.38.2
  • MozillaFirefox SLES for SAP 11 SP4, SLES 11 SP4, SLES 11 SP3-TERADATA +3 more 52.9.0esr-72.38.6
  • MozillaFirefox SLE Module for Desktop Applications 15 52.9.0esr-3.7.12
  • MozillaThunderbird SLE Workstation Extension 15 52.9.1-3.7.1

suse advisories SUSE-SU-2018:3247-1SUSE-SU-2018:2322-2SUSE-SU-2018:2325-1SUSE-SU-2018:2322-1SUSE-SU-2018:2298-1SUSE-SU-2018:2174-1

  • 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 60.3.0-74.2
  • seamonkey Package Hub 15 2.49.4-bp150.3.3.1

opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:10600-1openSUSE-SU-2024:10601-1openSUSE-SU-2018:3687-1openSUSE-SU-2018:2807-1

  • firefox Arch Linux 61.0-1
  • thunderbird Arch Linux 52.9.1-1

arch linux advisories AVG-727AVG-728

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-2018-12366 updated cvss 6.1

Mozilla: Invalid data handling during QCMS transformations

  • Red Hat Enterprise Linux Client (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5 Red Hat Enterprise Linux Client Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Desktop (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6 Red Hat Enterprise Linux Desktop Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2252
  • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox 60.1.0-5.el6 Red Hat Enterprise Linux Server (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Server Optional (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Server Optional (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2113
show 5 more
  • Red Hat Enterprise Linux Workstation (v. 6) firefox 60.1.0-5.el6, thunderbird 52.9.1-1.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation (v. 7) firefox 60.1.0-4.el7_5, thunderbird 52.9.1-1.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox 60.1.0-5.el6
    fixed: vendor fix RHSA-2018:2112
  • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 60.1.0-4.el7_5
    fixed: vendor fix RHSA-2018:2113
  • Red Hat Enterprise Linux 8 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

3.16% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 6.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

  • Mozilla Thunderbird
  • Mozilla Firefox ESR
  • Mozilla Firefox

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.