CVE-2026-100814

Analyzed Analyzed - Analysis Complete

Incorrect Boundary Conditions in Firefox JavaScript Engine JIT

Publication date: 2026-09-29

Last updated on: 2026-10-05

Assigner: Mozilla Corporation

Description

Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-29

Last Modified

2026-10-05

Generated

2026-10-19

AI Q&A

2026-09-29

EPSS Evaluated

2026-10-18

NVD

CVE-2026-100814

EUVD

EUVD-2026-88793

Affected Vendors & Products

Vendor	Product	Version / Range
mozilla	firefox	to 153.4.0 (exc)
mozilla	firefox	From 154.0.0 (inc) to 157.0.0 (exc)
mozilla	thunderbird	to 153.4.0 (exc)
mozilla	thunderbird	From 154.0 (inc) to 157.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-119	The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Attack-Flow Graph

Executive Summary

This vulnerability involves incorrect boundary conditions in the JavaScript Engine's JIT component. It was addressed in Firefox ESR 153.4 and Firefox 157.

Detection Guidance

This vulnerability is specific to the JavaScript Engine JIT component in Firefox. Detection requires checking the installed Firefox version. If you are running Firefox ESR 153.4 or Firefox 157 or later, the vulnerability is patched. Otherwise, the system is vulnerable. Use commands like 'firefox --version' to check the installed version.

Impact Analysis

The vulnerability could allow attackers to execute arbitrary code or cause crashes by exploiting boundary condition errors in the JavaScript JIT component.

Compliance Impact

The provided CVE data does not specify direct impacts on compliance with GDPR, HIPAA, or other standards. The vulnerability involves incorrect boundary conditions in the JavaScript Engine JIT component, which could lead to high-impact security issues such as code execution or data breaches. Such vulnerabilities may indirectly affect compliance by increasing risks of unauthorized data access or processing, but specific regulatory impacts are not detailed here.

Mitigation Strategies

Update Firefox ESR to version 153.4 or later and Firefox to version 157 or later to address the vulnerability.

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