CVE-2026-16357: Incorrect boundary conditions in the Graphics component

Published Jul 21, 2026
·
Updated

Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.

Affected Software

12 affected componentsFixes available
Mozilla Firefox<153
Mozilla Firefox ESR<115.38, <140.13
Mozilla Firefox<153
153
Mozilla Firefox ESR<115.38
115.38
Mozilla Firefox ESR<140.13
140.13
Mozilla Thunderbird<140.13
140.13
Mozilla Thunderbird<153
153
Mozilla Firefox<115.38.0
Mozilla Firefox<153.0.0
Mozilla Firefox>=128.1.0<140.13.0
Mozilla Thunderbird<140.13.0
Mozilla Thunderbird>=141.0<153.0

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 153
  2. Upgrade

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

    Fixed in 115.38
  3. Upgrade

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

    Fixed in 140.13
  4. Upgrade

    Upgrade Firefox to a version that resolves this vulnerability.

    Fixed in 153
  5. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 115.38
  6. Upgrade

    Upgrade Firefox ESR to a version that resolves this vulnerability.

    Fixed in 140.13
  7. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 153
  8. Upgrade

    Upgrade Thunderbird to a version that resolves this vulnerability.

    Fixed in 140.13

Event History

Jul 21, 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·12:37 PM
Data Sourced
via MITRE·12:37 PM
Description
Data Sourced
via NVD·01:17 PM
DescriptionSeverityWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-16357?

CVE-2026-16357 has a severity rating of critical with a CVSS score of 9.8.

2

What impact does CVE-2026-16357 have on affected systems?

CVE-2026-16357 can lead to potential buffer overflow vulnerabilities affecting confidentiality, integrity, and availability.

3

How do I fix CVE-2026-16357?

To fix CVE-2026-16357, update to Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, or Thunderbird 140.13.

4

Which software is affected by CVE-2026-16357?

CVE-2026-16357 affects Mozilla Firefox, Mozilla Firefox ESR, and Mozilla Thunderbird.

5

When was CVE-2026-16357 published?

CVE-2026-16357 was published on July 21, 2026.

Company

Resources

Contact

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