CVE-2026-12324
published 2026-06-16CVE-2026-12324: Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and…
PriorityP341high7.3CVSS 3.1
AVNACLPRNUINSUCLILAL
EPSS
0.21%
10.3th percentile
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.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.12 | Firefox ESR 140.12 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | — | — |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.17.3HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
vendor_redhat7.3HIGH
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VulDB
Mozilla Firefox up to 151 CanvasWebGL memory corruption (EUVD-2026-37070)
vuldb·2026-06-16·CVSS 7.3
CVE-2026-12324 [HIGH] Mozilla Firefox up to 151 CanvasWebGL memory corruption (EUVD-2026-37070)
A vulnerability was found in Mozilla Firefox up to 151. It has been rated as critical. This affects an unknown part of the component CanvasWebGL. This manipulation causes memory corruption.
The identification of this vulnerability is CVE-2026-12324. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is advised.
GHSA
Incorrect boundary conditions in the Graphics: CanvasWebGL component.
ghsa_unreviewed·2026-06-16
CVE-2026-12324 [HIGH] CWE-703 Incorrect boundary conditions in the Graphics: CanvasWebGL component.
Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Red Hat
firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
vendor_redhat·2026-06-16·CVSS 7.3
CVE-2026-12324 [HIGH] CWE-131 firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
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.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Incorrect boundary conditions in the Graphics: CanvasWebGL component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Pac
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12324
vendor_mozilla·CVSS 7.3
CVE-2026-12324 [HIGH] Mozilla Foundation Security Advisory 2026-61: CVE-2026-12324
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12324
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12324
vendor_mozilla·CVSS 7.3
CVE-2026-12324 [HIGH] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12324
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12324
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12324
vendor_mozilla·CVSS 7.3
CVE-2026-12324 [HIGH] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12324
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12324
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12324
vendor_mozilla·CVSS 7.3
CVE-2026-12324 [HIGH] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12324
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12324
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-12324 firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
bugzilla·2026-06-16·CVSS 7.3
CVE-2026-12324 [HIGH] CVE-2026-12324 firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2026-12324 firefox: thunderbird: Incorrect boundary conditions in the Graphics: CanvasWebGL component
Incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Bugzilla
WebGLTransformFeedback::mActive_VertCapacity desync allows host-authorised TF write past buffer end after paused bufferData shrink
bugzilla·2026-05-09·CVSS 9.3
CVE-2023-5724 [CRITICAL] WebGLTransformFeedback::mActive_VertCapacity desync allows host-authorised TF write past buffer end after paused bufferData shrink
WebGLTransformFeedback::mActive_VertCapacity desync allows host-authorised TF write past buffer end after paused bufferData shrink
Created attachment 9584820
sibling2.html
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:150.0) Gecko/20100101 Firefox/150.0
Steps to reproduce:
-
Actual results:
**Filing fields**
| Field | Value |
|---|---|
| Product | Core |
| Component | Graphics: CanvasWebGL |
| Type | defect |
| Group | Core Security (yes, mark as security bug) |
| Version | Firefox 150.0 |
| Platform / OS | All; tested on macOS Apple Silicon |
| See Also | bug 2037323, bug 2038302, bug 1836705 (CVE-2023-5724), bug 1028891 (CVE-2014-1556) |
**Attach:** sibling2.html
## Summary
Sibling to bug 2037323 / 2038302. Different cache, different code path, different impact
2026-06-16
Published