CVE-2025-0240: Compartment mismatch when parsing JavaScript JSON module

Published Jan 7, 2025
·
Updated

Last updated 9 January 2025

Other sources

Parsing a JavaScript module as JSON could under some circumstances cause cross-compartment access, which may result in a use-after-free.

— Mozilla

Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free.

— Mozilla

Affected Software

10 affected componentsFixes available
debian/firefox
134.0-1
debian/firefox-esr<=115.14.0esr-1~deb11u1, <=128.5.0esr-1~deb11u1, <=128.3.1esr-1~deb12u1, <=128.5.0esr-1
128.6.0esr-1~deb12u1128.6.0esr-1
Mozilla Thunderbird<128.6
128.6
Mozilla Thunderbird<134
134
Mozilla Firefox ESR<128.6
128.6
Mozilla Firefox<134
134
Mozilla Firefox<128.6.0
Mozilla Firefox<134.0
Mozilla Thunderbird<128.6.0
Mozilla Thunderbird>=129.0<134.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/firefox to a version that resolves this vulnerability.

    Fixed in 134.0-1
  2. Upgrade

    Upgrade debian/firefox-esr to a version that resolves this vulnerability.

    Fixed in 128.6.0esr-1~deb12u1Fixed in 128.6.0esr-1
  3. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 128.6
  4. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 134
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 128.6
  6. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 134
  7. Upgrade

    Upgrade Thunderbird ESR to a version that resolves this vulnerability.

    Fixed in 128.6

Event History

Jan 7, 2025
CVE Published
via Mozilla·12:00 AM
CVE Published
via MITRE·04:07 PM
Data Sourced
via MITRE·04:07 PM
Description
Data Sourced
via NVD·04:15 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·04:15 PM
Affected Software
Data Sourced
via Red Hat·05:02 PM
DescriptionSeverityAffected Software
Jan 13, 2025
Data Sourced
via Ubuntu·05:36 AM
RemedyDescriptionSeverityAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2025-0240?

CVE-2025-0240 is considered a critical vulnerability due to its potential for causing a use-after-free condition.

2

How do I fix CVE-2025-0240?

To fix CVE-2025-0240, update affected software to the versions specified in the vulnerability report.

3

What software is affected by CVE-2025-0240?

CVE-2025-0240 affects Mozilla Firefox, Firefox ESR, and Thunderbird versions up to 134 and 128.6 respectively.

4

What vulnerabilities can occur due to CVE-2025-0240?

CVE-2025-0240 may lead to cross-compartment access, resulting in potential code execution or memory corruption.

5

When was CVE-2025-0240 last updated?

CVE-2025-0240 was last updated on 9 January 2025.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203