Mozilla Firefox EUVD-2026-60690

No special server-side configuration is required - Firefox's Graphics component processes graphical content by default in all standard installations. The CVSS vector PR:N/AC:L confirms unauthenticated, low-complexity exploitation requiring no attacker privileges. The primary limiting factor is impact scope: the CVSS vector explicitly shows C:N and I:N, meaning confirmed exploitation results only in browser unavailability (crash/DoS), not data theft or code execution. Exploitation requires the victim's Firefox browser to render attacker-supplied graphical content, which can be delivered passively through any webpage, embedded advertisement, or cross-origin iframe - the victim need only visit a page that loads the payload. All Firefox versions below 154 and all ESR versions below 153.1 on any platform are within scope per the wildcard CPE.

CVSS 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) classifies this as high severity with a fully remote, unauthenticated, low-complexity attack path. The UI:N metric warrants scrutiny for a browser vulnerability - browser rendering flaws typically require the user to load a page, which most analysts classify as UI:R; this discrepancy should be verified against Mozilla's Bugzilla entry at https://bugzilla.mozilla.org/show_bug.cgi?id=2028440. The confirmed impact is availability-only (A:H, C:N, I:N), capping worst-case outcome at browser crash and denial of service, with no confirmed data exfiltration or code execution path indicated by the CVSS vector. However, the co-occurrence of 'Integer Overflow' and 'Buffer Overflow' tags introduces residual concern that memory corruption could be exploitable beyond DoS under certain conditions - this is inferred from tags, not confirmed by CVSS. No EPSS score, KEV listing, or public exploit was provided, which reduces immediate operational urgency. Given Firefox's ubiquitous deployment, patch prioritization is strongly warranted even absent active exploitation evidence.

An attacker crafts a webpage containing malicious graphical content - such as a distorted SVG, oversized canvas element, or manipulated WebGL buffer - sized to trigger the integer overflow in Firefox's Graphics component during render. When a victim browses to the page or loads an iframe or advertisement containing the payload, Firefox processes the content and the arithmetic overflow corrupts internal renderer state, causing the browser process to crash and producing a denial of service. No public exploit code has been identified at time of analysis.