CVE-2023-43686
Description
Malwarebytes and Nebula are vulnerable to denial of service if a large number of Firefox preference files are present, causing other browser configurations to be ignored.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Malwarebytes and Nebula are vulnerable to denial of service if a large number of Firefox preference files are present, causing other browser configurations to be ignored.
Vulnerability
An improper handling of exceptional conditions vulnerability exists in Malwarebytes 4.x and 5.x, and the Nebula platform (2020-10-21 and later) [1]. A large number of Firefox preference files can cause the parser to ignore other browser configuration files. Affected versions include Malwarebytes 4 versions prior to 4.6.14.326, Malwarebytes 5 versions prior to 5.1.5.116, and the Nebula platform before June 2024.
Exploitation
An attacker would need to ensure a large number of Firefox preference files are present on the affected system. The vulnerability is triggered by the parser's behavior when encountering this condition, leading to the denial of service.
Impact
Successful exploitation of this vulnerability results in a denial of service. The parser ignoring other browser configuration files can disrupt normal operations of the affected software.
Mitigation
Malwarebytes 4 versions 4.6.14.326 and later, Malwarebytes 5 versions 5.1.5.116 and later, and the Nebula platform from June 2024 are patched [1]. Upgrading affected endpoints to the patched versions is recommended.
AI Insight generated on Jun 9, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
2- Range: >= 2020-10-21
- Range: 4.x, 5.x
Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
1News mentions
0No linked articles in our index yet.