CVE-2026-84141

Modified Modified - Updated After Analysis

Integer Overflow in Firefox Graphics ImageLib

Publication date: 2026-09-01

Last updated on: 2026-09-03

Assigner: Mozilla Corporation

Description

Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-01

Last Modified

2026-09-03

Generated

2026-09-21

AI Q&A

2026-09-01

EPSS Evaluated

2026-09-20

NVD

CVE-2026-84141

EUVD

EUVD-2026-69089

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.2.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 155.0.0 (exc)
mozilla	thunderbird	to 153.2.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 155.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow in the Graphics: ImageLib component of Firefox. An integer overflow occurs when a calculation produces a result larger than the maximum value that can be stored in the data type, potentially leading to unexpected behavior or crashes.

Detection Guidance

This vulnerability is fixed in Firefox 155 and Firefox ESR 153.2. To detect it, check your installed Firefox version using commands like 'firefox --version' or 'apt show firefox' (Linux) or 'brew info firefox' (macOS). If the version is below 155 or ESR 153.2, the system is vulnerable.

Impact Analysis

An attacker could exploit this vulnerability to cause a crash or execute arbitrary code on your system by triggering the integer overflow through specially crafted images. This could lead to denial of service or potential compromise of your device.

Compliance Impact

The provided CVE data does not specify how this vulnerability impacts compliance with standards like GDPR or HIPAA. The description only mentions an integer overflow in the Graphics: ImageLib component fixed in Firefox 155 and Firefox ESR 153.2.

Mitigation Strategies

Update Firefox to version 155 or later and Firefox ESR to version 153.2 or later to address the integer overflow in the Graphics: ImageLib component.

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