CVE-2026-100759: Uninitialized memory in the Storage: Quota Manager component

Published Sep 29, 2026
·
Updated

Uninitialized memory in the Storage: Quota Manager component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Affected Software

4 affected componentsFixes available
Mozilla Firefox ESR<115.42
115.42
Mozilla Firefox ESR<140.17
140.17
Mozilla Firefox<157
157
Mozilla Firefox ESR<153.4
153.4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 115.42
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 140.17
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 157
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 153.4
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 153.4
  6. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 157
  7. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.42
  8. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.17

Event History

Sep 29, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:35 PM
Data Sourced
via MITRE·12:35 PM
Description
Data Sourced
via NVD·01:17 PM
Description

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Which Firefox releases contain the fix?

The issue was fixed in Firefox 157, Firefox ESR 153.4, Firefox ESR 115.42, and Firefox ESR 140.17.

2

How can I determine whether an installation still needs remediation?

Check the installed Firefox or Firefox ESR version. Installations below the listed fixed release for their applicable release line should be updated.

Company

Resources

Contact

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