CVE-2026-100775

Analyzed Analyzed - Analysis Complete

Sandbox Escape in Firefox Graphics Component

Publication date: 2026-09-29

Last updated on: 2026-10-06

Assigner: Mozilla Corporation

Description

Sandbox escape in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-29

Last Modified

2026-10-06

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100775

EUVD

EUVD-2026-88927

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	thunderbird	From 140.0 (inc) to 140.17.0 (exc)
mozilla	thunderbird	From 153.0 (inc) to 153.4.0 (exc)
mozilla	firefox	From 115.0.1 (inc) to 115.42.0 (exc)
mozilla	firefox	From 140.0.0 (inc) to 140.17.0 (exc)
mozilla	firefox	From 153.0.0 (inc) to 153.4.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-693	The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

Attack-Flow Graph

Executive Summary

This is a sandbox escape vulnerability in the Graphics component of Firefox browsers. It allows malicious code to break out of the browser's security sandbox, potentially gaining unauthorized access to the host system.

Detection Guidance

This vulnerability is a sandbox escape in Firefox's Graphics component. To detect it, check if your Firefox version is outdated. Compare your installed version against Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17. Use commands like 'firefox --version' or check via package manager (e.g., 'apt list --installed | grep firefox' for Debian-based systems).

If your version is older, the system is vulnerable. Update Firefox immediately to the patched version to mitigate the risk.

Impact Analysis

If exploited, this vulnerability could allow attackers to run arbitrary code on your system with the same privileges as your user account. This could lead to data theft, malware installation, or further network compromise.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions a sandbox escape in the Graphics component without detailing potential data exposure or regulatory implications.

Mitigation Strategies

Update Firefox to a patched version: Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, or Firefox ESR 140.17 or later.

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