CVE-2026-12297
Modified
Modified - Updated After Analysis
Sandbox Escape in Firefox Due to Boundary Condition Error
Vulnerability report for CVE-2026-12297, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-06-16
Last updated on: 2026-06-30
Assigner: Mozilla Corporation
Description
Description
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | to 152.0.0 (exc) |
| mozilla | firefox | to 115.37.0 (exc) |
| mozilla | thunderbird | to 152.0.0 (exc) |
| mozilla | thunderbird | to 140.12.0 (exc) |
| mozilla | firefox | From 128.0 (inc) to 140.12.0 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
| CWE-653 | The product does not properly compartmentalize or isolate functionality, processes, or resources that require different privilege levels, rights, or permissions. |
