CVE-2026-8947
Analyzed Analyzed - Analysis Complete

Use-after-free in Firefox DOM Bindings

Publication date: 2026-05-19

Last updated on: 2026-05-19

Assigner: Mozilla Corporation

Description
Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

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Meta Information

Published
2026-05-19
Last Modified
2026-05-19
Generated
2026-06-30
AI Q&A
2026-05-19
EPSS Evaluated
2026-06-28
NVD
CVE-2026-8947
EUVD
EUVD-2026-30896

Affected Vendors & Products

Showing 4 associated CPEs
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
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KEV
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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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

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Compliance Impact

The provided information does not specify how CVE-2026-8947 affects compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

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.

Impact Analysis

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.

Mitigation Strategies

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.

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