CVE-2025-14322Network attack vector

Sandbox escape via incorrect CanvasWebGL boundary checks

Published Dec 9, 2025 · Updated Apr 13, 2026

Incorrect boundary checks in Mozilla Firefox and Thunderbird allow remote attackers to escape the content sandbox through CanvasWebGL. Mozilla identifies the Graphics: CanvasWebGL component and incorrect boundary conditions, but the restricted defect report leaves the failing operation undisclosed. Exploitation requires user interaction and high-complexity network input; a successful escape compromises confidentiality and integrity beyond the sandbox.

CVSS severity8.0
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect boundary checks in Mozilla Firefox and Thunderbird allow remote attackers to escape the content sandbox through CanvasWebGL. Mozilla identifies the Graphics: CanvasWebGL component and incorrect boundary conditions, but the restricted defect report leaves the failing operation undisclosed. Exploitation requires user interaction and high-complexity network input; a successful escape compromises confidentiality and integrity beyond the sandbox.

The record

CVE
CVE-2025-14322
Published
Dec 9, 2025
Updated
Apr 13, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-754, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.0CISA ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-754Improper Check for Unusual or Exceptional Conditions
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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