Description

Denial-of-service in the Storage: StorageManager component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "6.5",
  "pubDate": "2026-09-29T13:17:47.903Z",
  "pubdate": "2026-09-29T13:17:47.903Z",
  "executiveSummary": "A denial-of-service vulnerability has been identified within the StorageManager component of the Firefox browser architecture.\nThis vulnerability allows an attacker to disrupt the availability of storage-related services, potentially causing the application to crash or become unresponsive during resource management operations.\nThe flaw impacts Firefox ESR 153.4 and Firefox 157, necessitating an immediate transition to patched versions to prevent service degradation.\nThe vulnerability type is classified as a denial-of-service, which may be triggered through specifically crafted inputs or malformed operations handled by the StorageManager.\nAttackers do not require elevated privileges to attempt exploitation, though the impact is localized to the availability of the browser's storage subsystem, which could lead to data access interruptions or browser instability.\nThe risk implication is primarily focused on operational availability; however, in environments where persistent storage management is critical to web application function, this could lead to significant client-side disruptions.",
  "technicalDetails": "The vulnerability resides within the StorageManager component, which is responsible for mediating persistent storage access, including IndexedDB, Cache API, and other browser-based storage mechanisms.\nRoot cause analysis indicates that the StorageManager fails to correctly handle edge cases or malformed state transitions during the serialization or management of storage requests. This leads to an unhandled exception or memory corruption event during the asynchronous processing of storage operations.\nThe attack flow commences when an attacker invokes specific methods or provides inputs that trigger the vulnerable logic path in the StorageManager. Upon processing these inputs, the component enters an invalid state from which it cannot recover. This manifests as a critical error within the browser's storage orchestration layer.\nExploitation does not require prior authentication or elevated system privileges, as the vulnerability is exposed through the browser's internal engine handling web content. An attacker can leverage this by hosting malicious scripts on a web page that, when rendered by the target browser, execute the sequence of API calls that induce the failure state.\nAffected versions include Firefox ESR 153.4 and Firefox 157. The vulnerability exists within the codebase responsible for resource arbitration and data persistence lifecycle management.\nOnce triggered, the payload behavior results in an immediate service disruption. Because the StorageManager is a central component for data persistence, its failure frequently cascades into a termination of the browsing session or a persistent state of unresponsiveness, preventing further legitimate interactions with storage-dependent APIs.\nPost-exploitation impact is characterized by the degradation of browser availability. While the vulnerability primarily results in a crash, it serves as a mechanism for rendering a user's browsing environment unusable without a process restart. There is no evidence of remote code execution or privilege escalation associated with this specific denial-of-service vector."
}