CVE-2026-12324 | Incorrect boundary conditions in the Graphics: CanvasWebGL c… | CVSS 7.3 HIGH

Description

Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.

Metadata

CVE ID: CVE-2026-12324
State: PUBLISHED
Assigner: mozilla
Reserved: 2026-06-15 15:08 UTC
Published: 2026-06-16 11:52 UTC
Last updated: 2026-06-16 16:11 UTC
Primary CWE: CWE-703
CWE-703 Improper Check or Handling of Exceptional Conditions
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

7.3 HIGH CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (2)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	140.12 ≤ 140., 152 ≤
Mozilla	Thunderbird	—	140.12 ≤ 140., 152 ≤

Weakness (CWE)

CWE	Source	Description
CWE-703	adp	CWE-703 Improper Check or Handling of Exceptional Conditions

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.3	HIGH	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

References (5)