CVE-2026-100771
Received Received - Intake

Undefined Behavior in Firefox DOM Streams

Publication date: 2026-09-29

Last updated on: 2026-09-29

Assigner: Mozilla Corporation

Description
Undefined behavior in the DOM: Streams component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

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Meta Information

Published
2026-09-29
Last Modified
2026-09-29
Generated
2026-09-29
AI Q&A
2026-09-29
EPSS Evaluated
N/A
NVD
CVE-2026-100771
EUVD
EUVD-2026-88923

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
mozilla firefox 153.4
mozilla firefox 157
mozilla firefox 115.42
mozilla firefox 140.17

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability involves undefined behavior in the DOM Streams component of Firefox browsers. It was patched in multiple Firefox versions including ESR 153.4, Firefox 157, ESR 115.42, and ESR 140.17.

Detection Guidance

Detection of this vulnerability requires checking the installed version of Firefox or Firefox ESR. Compare your version against the fixed versions: Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17. Use commands like 'firefox --version' or 'apt show firefox' (Linux) to check the version.

Impact Analysis

Undefined behavior in DOM Streams could lead to crashes, unexpected behavior, or potential security exploits like code execution or data leaks if exploited by attackers.

Mitigation Strategies

Update Firefox to version 157 or later, Firefox ESR 115.42 or later, or Firefox ESR 140.17 or later to address the DOM Streams component vulnerability.

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