CVE-2018-12359

critical
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
9.5

Description

A buffer overflow can occur when rendering canvas content while adjusting the height and width of the canvas element dynamically, causing data to be written outside of the currently computed boundaries. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60, Thunderbird < 52.9, Firefox ESR < 60.1, Firefox ESR < 52.9, and Firefox < 61.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2018-12359

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2018-12359.html

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201806-14

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201807-4

OS impact

OSVersionStatusFixed in
arch archfixed52.9.1-1
suse slesaffected
debian debiansidfixed61.0-1
debian debianbookwormfixed52.9.0esr-1
debian debianbullseyefixed52.9.0esr-1
debian debianforkyfixed52.9.0esr-1
debian debiantrixiefixed52.9.0esr-1

References

Verify integrity in audit chain (admin only). AS-IS.