Description
On some systems—depending on the graphics settings and drivers—it was possible to force an out-of-bounds read and leak memory data into the images created on the canvas element. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
References (7)
Core 7
Core References
Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1841050
Third Party Advisory
https://www.debian.org/security/2023/dsa-5561
Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-49/
Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-50/
Release Notes, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-52/
Scores
CVSS v3
6.5
EPSS
0.0027
EPSS Percentile
49.9%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Details
CWE
CWE-125
Status
published
Products (6)
debian/debian_linux
10.0
debian/debian_linux
11.0
debian/debian_linux
12.0
mozilla/firefox
< 120.0
mozilla/firefox_esr
< 115.5.0
mozilla/thunderbird
< 115.5
Published
Nov 21, 2023
Tracked Since
Feb 18, 2026