OPENSUSE-SU-2026:21519-1: MozillaFirefox security update

OPENSUSE-SU-2026:21519-1, released August 3, 2026, fixes 32 CVEs in MozillaFirefox (version 140.13.0-160000.1.1). None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

7 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0049

42nd percentile

Priority of the 32 CVEs

Patch now 0
                                Urgent 7
                                High 25
                                Routine 0

Fixed package versions

Product	Release	Fixed in
MozillaFirefox	opensuse-leap 16.0	140.13.0-160000.1.1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-12295	Sandbox escape in the DOM: Navigation component	9.6	0.0039	None reported
Urgent	CVE-2026-12296	Sandbox escape in the Security: Process Sandboxing component	9.6	0.0039	None reported
Urgent	CVE-2026-12297	Sandbox escape due to incorrect boundary conditions in the Networking component	9.6	0.0039	None reported
Urgent	CVE-2026-12294	Sandbox escape in the DOM: Workers component	9.6	0.0036	None reported
Urgent	CVE-2026-16361	Memory safety bugs fixed in Thunderbird ESR 140.13	9.8	0.0032	None reported
Urgent	CVE-2026-12315	Mitigation bypass in the DOM: Security component	9.1	0.0025	None reported
Urgent	CVE-2026-12304	Same-origin policy bypass in the Networking: Cookies component	9.1	0.0019	None reported
High	CVE-2026-12292	Incorrect boundary conditions in the Web Audio component	8.1	0.0049	None reported
High	CVE-2026-15718	Invalid pointer in the JavaScript: WebAssembly component	8.8	0.0049	None reported
High	CVE-2026-12328	Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152	8.1	0.0048	None reported
High	CVE-2026-12327	Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152	8.1	0.0041	None reported
High	CVE-2026-12290	Memory safety bug fixed in Thunderbird 152	8.1	0.0040	None reported
High	CVE-2026-12289	Privilege escalation in the Graphics: WebRender component	8.8	0.0040	None reported
High	CVE-2026-12291	Use-after-free in the Networking: HTTP component	8.8	0.0038	None reported
High	CVE-2026-12305	Memory safety bug fixed in Thunderbird 152	7.5	0.0037	None reported
High	CVE-2026-15719	Site isolation issue in the DOM: Navigation component	8.8	0.0034	None reported
High	CVE-2026-12329	Memory safety bug fixed in Thunderbird ESR 140.12	7.5	0.0031	None reported
High	CVE-2026-12298	Memory safety bug fixed in Thunderbird 152	7.5	0.0031	None reported
High	CVE-2026-12299	JIT miscompilation in the DOM: Core & HTML component	7.5	0.0031	None reported
High	CVE-2026-12306	Memory safety bug fixed in Thunderbird 152	7.5	0.0026	None reported
High	CVE-2026-12307	Memory safety bug fixed in Thunderbird 152	7.5	0.0026	None reported
High	CVE-2026-12308	Memory safety bug fixed in Thunderbird 152	7.5	0.0026	None reported
High	CVE-2026-12310	Memory safety bug fixed in Thunderbird 152	7.5	0.0025	None reported
High	CVE-2026-12312	Memory safety bug fixed in Thunderbird 152	7.5	0.0025	None reported
High	CVE-2026-12314	Memory safety bug fixed in Thunderbird 152	7.5	0.0025	None reported

Also fixes CVE-2026-12297

Mozilla Firefox ESR (ach) 153.0.0
Mozilla Firefox ESR (ach)
Mozilla Firefox ESR (af) 153.0.0
Mozilla Firefox ESR (af)
Mozilla Firefox ESR (an) 153.0.0
Mozilla Firefox ESR (an)
Mozilla Firefox ESR (ar) 153.0.0
Mozilla Firefox ESR (ar)
Mozilla Firefox ESR (ast) 153.0.0
Mozilla Firefox ESR (ast)
Mozilla Firefox ESR (az) 153.0.0
Mozilla Firefox ESR (az)
Mozilla Firefox ESR (be) 153.0.0
Mozilla Firefox ESR (be)
Mozilla Firefox ESR (bg) 153.0.0
Mozilla Firefox ESR (bg)

Vendor advisory

https://osv.dev/vulnerability/openSUSE-SU-2026:21519-1

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