CVE-2026-8947
Use-after-free in Firefox DOM Bindings
Publication date: 2026-05-19
Last updated on: 2026-05-19
Assigner: Mozilla Corporation
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mozilla | firefox | From 140.0 (inc) to 140.11.0 (exc) |
| mozilla | firefox | to 151.0.0 (exc) |
| mozilla | firefox | to 115.36.0 (exc) |
| mozilla | thunderbird | to 140.11 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-416 | The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer. |
Attack-Flow Graph
AI Powered Q&A
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify how CVE-2026-8947 affects compliance with common standards and regulations such as GDPR or HIPAA.
Can you explain this vulnerability to me?
CVE-2026-8947 is a use-after-free vulnerability in the DOM: Bindings (WebIDL) component of Firefox ESR. This means that the software incorrectly handles memory by using memory after it has been freed, which can lead to unexpected behavior or security issues.
How can this vulnerability impact me? :
This vulnerability could allow an attacker to exploit memory corruption to potentially execute arbitrary code on the affected system. This means an attacker might gain control over the system or perform unauthorized actions.
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should update your Firefox or Firefox ESR browser to the fixed versions.
- Upgrade Firefox to version 151 or later.
- Upgrade Firefox ESR to version 115.36 or later.
- Upgrade Firefox ESR to version 140.11 or later.