CVE-2026-92037 in Firefox
Summary
by MITRE • 09/15/2026
Incorrect boundary conditions in the DOM: Animation component. This vulnerability was fixed in Firefox 156.
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Analysis
by VulDB Data Team • 09/15/2026
The identified vulnerability resides within the Document Object Model implementation of Mozilla Firefox, specifically affecting the animation component responsible for rendering visual transitions and effects on web pages. The core technical flaw stems from incorrect boundary conditions during the processing of animation properties or state changes. In complex DOM manipulation scenarios, particularly those involving rapid updates to animated elements, the browser fails to properly validate input parameters against expected limits. This oversight allows an attacker to trigger undefined behavior within the rendering engine by supplying crafted data that exceeds anticipated boundaries for size, duration, or property values associated with CSS animations or JavaScript-driven animation libraries.
From a technical perspective, this issue classifies under CWE-20 Improper Input Validation and potentially CWE-190 Integer Overflow or Wraparound if the boundary check involves numerical calculations that exceed allocated memory limits. The vulnerability exploits the gap between expected input constraints and actual runtime validation logic within the Gecko rendering engine. When an animation sequence is initiated with malformed parameters, the internal state machine may enter an inconsistent state. This can lead to memory corruption issues such as heap buffer overflows or use-after-free conditions if the browser attempts to access memory locations that were not properly allocated or have already been freed due to premature cleanup triggered by the invalid boundary condition.
The operational impact of this vulnerability is significant, particularly in environments where users are exposed to untrusted web content. An attacker could craft a malicious webpage containing specially designed animation code that exploits these incorrect boundary conditions. Successful exploitation could result in arbitrary code execution with the privileges of the victim user, allowing for full system compromise. Alternatively, even if remote code execution is not immediately achievable due to modern browser mitigations like ASLR and DEP, the vulnerability can be leveraged for Denial of Service attacks by causing the Firefox process or entire application to crash through memory corruption events triggered during animation rendering.
This type of flaw aligns with ATT&CK technique T1059 Command and Scripting Interpreter if it leads to script execution within a sandboxed context, though more critically it maps to privilege escalation vectors when combined with other vulnerabilities in the browser stack. The lack of strict boundary checks represents a fundamental security design weakness that undermines the integrity of the rendering pipeline. It highlights the importance of rigorous input sanitization and bounds checking in low-level components like animation engines which handle high-frequency updates from user interactions or automated scripts.
Mitigation strategies primarily involve applying the vendor-provided patch included in Firefox version 156, which corrects the boundary validation logic within the animation component. Organizations should ensure that all endpoints running Firefox are updated to this patched version immediately to eliminate the attack surface associated with DOM-based animation processing. For users unable to update immediately, employing browser extensions or network-level filtering solutions that block suspicious JavaScript patterns related to complex animations may provide temporary protection against exploitation attempts. Additionally, enabling strict Content Security Policy headers on web applications can help mitigate potential downstream impacts by restricting inline script execution and limiting the sources from which dynamic content is loaded.
Long-term remediation requires a shift toward more robust defensive coding practices in browser development lifecycles. Implementing automated fuzz testing specifically targeting animation APIs and DOM manipulation functions can help identify boundary condition errors before they reach production builds. Furthermore, adopting memory-safe languages for critical rendering components or utilizing static analysis tools that detect improper input validation patterns during code review phases would significantly reduce the likelihood of similar vulnerabilities arising in future releases. Continuous monitoring of browser security advisories remains essential to stay ahead of evolving exploitation techniques targeting these foundational web technologies.