CVE-2026-100788

Analyzed Analyzed - Analysis Complete

Memory Corruption in Firefox JavaScript WebAssembly

Publication date: 2026-09-29

Last updated on: 2026-10-19

Assigner: Mozilla Corporation

Description

Invalid pointer in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.

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Meta Information

Published

2026-09-29

Last Modified

2026-10-19

Generated

2026-11-08

AI Q&A

2026-09-29

EPSS Evaluated

2026-11-07

NVD

CVE-2026-100788

EUVD

EUVD-2026-88940

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)
mozilla	firefox	From 141.0 (inc) to 153.4.0 (exc)
mozilla	thunderbird	to 140.17.0 (exc)
mozilla	thunderbird	From 141.0 (inc) to 153.4.0 (exc)
mozilla	firefox	to 140.17.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-824	The product accesses or uses a pointer that has not been initialized.

Attack-Flow Graph

Executive Summary

This vulnerability involves an invalid pointer in the JavaScript WebAssembly component of Firefox browsers. It was addressed in specific Firefox updates, including ESR 153.4, Firefox 157, and ESR 140.17.

Detection Guidance

This vulnerability is specific to Firefox and related to JavaScript WebAssembly components. Detection involves checking Firefox version and scanning for related crashes or memory corruption issues.

Impact Analysis

An invalid pointer flaw could lead to crashes, unexpected behavior, or potential code execution exploits in affected Firefox versions. Users running unpatched browsers may face security risks.

Compliance Impact

The provided CVE data does not specify how this vulnerability affects compliance with standards like GDPR or HIPAA. The description only mentions an invalid pointer in the JavaScript WebAssembly component, fixed in specific Firefox versions.

Mitigation Strategies

Update Firefox to version ESR 153.4, Firefox 157, or Firefox ESR 140.17 or later to address the invalid pointer issue in the JavaScript: WebAssembly component.

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