Heap Buffer Overflow in Firefox

Executive Summary

CVE-2026-15719 is not explicitly described in the provided context. However, based on the available information, this vulnerability was fixed in Firefox 152.0.6. The CVSS v3.1 score of 5.4 indicates a medium-severity issue with low confidentiality and integrity impacts, requiring user interaction over a network.

The context mentions that exploit code for this vulnerability is public, but there are no known attacks in the wild abusing this flaw. The assigner is [email protected], and the vulnerability is associated with Mozilla Firefox.

Useful 0 Not Useful 0

Detection Guidance

The provided context does not specify detection methods or commands for identifying this vulnerability on a network or system. Detection typically involves checking the installed version of Firefox to determine if it is vulnerable.

• Verify the Firefox version: Run 'firefox --version' or check the 'About Firefox' section in the browser's menu to confirm if the installed version is 152.0.6 or later. Versions prior to 152.0.6 are vulnerable.

Since the vulnerability involves the JavaScript: WebAssembly component, monitoring for unusual WebAssembly-related activity in browser logs or network traffic may help, but specific detection commands are not provided in the context.

Useful 0 Not Useful 0

Impact Analysis

If you are using an affected version of Mozilla Firefox (prior to 152.0.6), this vulnerability could impact you in the following ways:

• An attacker could exploit this flaw by tricking you into visiting a malicious website or interacting with crafted content.
• Successful exploitation may lead to limited data disclosure (confidentiality impact) or minor modifications to data (integrity impact).

Since exploit code is publicly available, the risk of exploitation is higher, though no active attacks have been reported.

Useful 0 Not Useful 0

Compliance Impact

The impact on compliance depends on the nature of the data handled by the affected system and the specific regulations applicable to your organization.

• GDPR: If the vulnerability leads to unauthorized access or disclosure of personal data, it could result in a violation of GDPR's data protection requirements, potentially leading to fines or legal action.
• HIPAA: If the vulnerability affects systems processing protected health information (PHI), it could lead to a breach of HIPAA's security rules, requiring notification and potential penalties.

Since the vulnerability has a low confidentiality and integrity impact, the risk to compliance may be limited, but organizations should still assess their exposure and apply the available patch to mitigate potential risks.

Useful 0 Not Useful 0

Mitigation Strategies

The vulnerability was fixed in Firefox 152.0.6. The immediate step to mitigate this issue is to ensure all systems are updated to this version or later.

• Update Firefox to version 152.0.6 or newer. This can be done via the browser's built-in update mechanism or by downloading the latest version from Mozilla's official website.
• If updating is not immediately possible, consider disabling WebAssembly in Firefox as a temporary workaround. This can be done by setting 'javascript.options.wasm' to 'false' in the browser's configuration (about:config).

Monitor Mozilla's security advisories for any additional guidance or patches related to this vulnerability.

Useful 0 Not Useful 0