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SUSE MozillaFirefox Important Denial of Service Threat 2026-2583-1

suse
Calendar Grey June 23, 2026
Dist Suse Esm H88
A critical update for Mozilla Firefox from SUSE addresses 29 security threats to ensure system integrity and safety.
An update that solves 29 vulnerabilities can now be installed.

Summary

## This update for MozillaFirefox fixes the following issues: Update to Firefox 140.12.0 ESR (MFSA 2026-58, bsc#1268071): * CVE-2026-12289: Privilege escalation in the Graphics: WebRender component. * CVE-2026-12290: Memory safety bug fixed in Firefox ESR 140.12. * CVE-2026-12291: Use-after-free in the Networking: HTTP component. * CVE-2026-12292: Incorrect boundary conditions in the Web Audio component. * CVE-2026-12294: Sandbox escape in the DOM: Workers component. * CVE-2026-12295: Sandbox escape in the DOM: Navigation component. * CVE-2026-12296: Sandbox escape in the Security: Process Sandboxing component. * CVE-2026-12297: Sandbox escape due to incorrect boundary conditions in the Networking component. * CVE-2026-12298: Memory safety bug fixed in Firefox ESR 140.12.

Topics%20covered

Topics Covered

security advisory denial of service SuSE important memory safety sandbox escape

References

* bsc#1268071

Cross-

* CVE-2026-12289

* CVE-2026-12290

* CVE-2026-12291

* CVE-2026-12292

* CVE-2026-12294

* CVE-2026-12295

* CVE-2026-12296

* CVE-2026-12297

* CVE-2026-12298

* CVE-2026-12299

* CVE-2026-12302

* CVE-2026-12304

* CVE-2026-12305

* CVE-2026-12306

* CVE-2026-12307

* CVE-2026-12308

* CVE-2026-12309

* CVE-2026-12310

* CVE-2026-12311

* CVE-2026-12312

* CVE-2026-12313

* CVE-2026-12314

* CVE-2026-12315

* CVE-2026-12324

* CVE-2026-12325

* CVE-2026-12327

* CVE-2026-12328

* CVE-2026-12329

* CVE-2026-12330

CVSS scores:

* CVE-2026-12289 ( NVD ): 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

* CVE-2026-12290 ( SUSE ): 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

* CVE-2026-12290 ( NVD ): 8.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:2583-1
Release Date: 2026-06-23T13:27:27Z
Rating: important

Topics%20covered

Topics Covered

security advisory denial of service SuSE important memory safety sandbox escape

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