mozilla firefox CVE-2026-117915 vulnerability in Mozilla Products
Published on October 27, 2026

Incorrect boundary conditions in the Layout: Block and Inline component

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Incorrect boundary conditions in the Layout: Block and Inline component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

NVD

Vulnerability Analysis

CVE-2026-117915 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be low. considered to have a small impact on confidentiality and integrity and availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
LOW
Integrity Impact:
LOW
Availability Impact:
LOW

Weakness Type

What is a Buffer Overflow Vulnerability?

The software performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer.

CVE-2026-117915 has been classified to as a Buffer Overflow vulnerability or weakness.


Products Associated with CVE-2026-117915

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Affected Versions

Mozilla Firefox: Mozilla Thunderbird: