CVE-2026-16357 in Firefox
Summary
by MITRE • 07/21/2026
Incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.
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Analysis
by VulDB Data Team • 07/21/2026
This vulnerability resides within the graphics component of the firefox browser, representing a classic boundary condition error that can lead to arbitrary code execution or system compromise. The flaw manifests when the graphics rendering engine fails to properly validate input boundaries during graphic processing operations, creating potential attack vectors for malicious actors to exploit. Such issues typically arise in complex multimedia handling systems where buffer overflows or underflows can occur when processing malformed graphic data or performing memory operations beyond allocated boundaries.
The technical nature of this vulnerability aligns with common software security weaknesses documented in the common weakness enumeration catalog under cwe-129 and cwe-787, which specifically address issues related to insufficient boundary checking and out-of-bounds reads/writes. These conditions often enable attackers to manipulate memory layout or execute crafted code through carefully constructed graphic inputs designed to trigger the flawed boundary validation logic. The graphics component typically handles various file formats including png jpeg webp and svg images, making it a prime target for exploitation as these formats can contain embedded data that when improperly validated leads to memory corruption.
Operational impact of this vulnerability extends beyond simple browser crashes or rendering issues to potentially allow full system compromise through remote code execution. Attackers could craft malicious websites or graphic files that when opened in affected firefox versions trigger the boundary condition, leading to privilege escalation and persistent system access. The severity classification typically ranges from high to critical depending on the specific implementation details of how memory corruption occurs. This vulnerability affects not only end users but also enterprise environments where firefox is extensively deployed, creating potential for widespread compromise across networked systems.
Mitigation strategies should prioritize immediate patching of affected firefox installations to version 153 or the corresponding esr versions 115.38 and 140.13 as specified in the advisory. Organizations should implement browser hardening measures including content security policies, sandboxing configurations, and restricted graphics processing capabilities where possible. Additional protective measures include network-based filtering of suspicious graphic content, regular security assessments of web applications, and user education regarding safe browsing practices. The fix implemented by mozilla addresses the root cause through enhanced boundary validation in the graphics component and includes additional input sanitization routines to prevent similar conditions from occurring in future implementations. Security teams should monitor for any related vulnerabilities in third-party components that might be integrated with firefox's graphics subsystem and maintain updated threat intelligence feeds to identify potential exploitation attempts targeting this class of vulnerability.