High severity · published Apr 7, 2026
CVE-2026-5732
Incorrect boundary conditions, integer overflow in the Graphics: Text component
8.8
CVSS
0.4%
EPSS
No
On KEV
Description
Incorrect boundary conditions, integer overflow in the Graphics: Text component. This vulnerability was fixed in Firefox 149.0.2, Firefox ESR 140.9.1, Thunderbird 149.0.2, and Thunderbird 140.9.1.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 140.9.1; before 149.0.2 · source: NVD
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 6 · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Enterprise Linux 7 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5732
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5732
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=2017867
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-25/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-27/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-28/
www.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-29/
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:11805
More from Firefox
10.0
CVE-2019-11708
Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
9.8
CVE-2024-9680
Mozilla Firefox Use-After-Free Vulnerability
9.8
CVE-2010-3765
Mozilla Multiple Products Remote Code Execution Vulnerability
9.6
CVE-2022-26486
Mozilla Firefox Use-After-Free Vulnerability
8.8
CVE-2023-5217
Google Chromium libvpx Heap Buffer Overflow Vulnerability