firefox-140.7.0esr and js-140.7.0 (spidermonkey)

[Joe Locash]

Release notes not available yet.

[Joe Locash]

Security fixes:

• CVE-2026-0877: Mitigation bypass in the DOM: Security component (high)
• CVE-2026-0878: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component (high)
• CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component (high)
• CVE-2026-0880: Sandbox escape due to integer overflow in the Graphics component (high)
• CVE-2026-0882: Use-after-free in the IPC component (high)
• CVE-2025-14327: Spoofing issue in the Downloads Panel component (moderate)
• CVE-2026-0883: Information disclosure in the Networking component (moderate)
• CVE-2026-0884: Use-after-free in the JavaScript Engine component (moderate)
• CVE-2026-0885: Use-after-free in the JavaScript: GC component (moderate)
• CVE-2026-0886: Incorrect boundary conditions in the Graphics component (moderate)
• CVE-2026-0887: Clickjacking issue, information disclosure in the PDF Viewer component (moderate)
• CVE-2026-0890: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component (low)
• CVE-2026-0891: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 (high)

[zeckma]

Fixed at 234326ec690b09a4dd2ec9982df0b959a39f775d. Leaving open for SA.

[zeckma]

CVE-2026-0878, CVE-2026-0879, CVE-2026-0880, CVE-2026-0884, and CVE-2026-0885 fixed in SpiderMonkey.

[zeckma]

SA-12.4-072 and SA-12.4-073 issued.

[Bruce Dubbs]

Milestone renamed