CVE-2026-4687

Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2016368 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-20/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-21/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-22/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-23/
https://www.mozilla.org/security/advisories/mfsa2026-24/
https://access.redhat.com/errata/RHSA-2026:5930
https://access.redhat.com/errata/RHSA-2026:5931
https://access.redhat.com/errata/RHSA-2026:5932
https://access.redhat.com/errata/RHSA-2026:6188
https://access.redhat.com/errata/RHSA-2026:6342
https://access.redhat.com/errata/RHSA-2026:6917
https://access.redhat.com/errata/RHSA-2026:7837
https://access.redhat.com/errata/RHSA-2026:7838
https://access.redhat.com/errata/RHSA-2026:7839
https://access.redhat.com/errata/RHSA-2026:7840
https://access.redhat.com/errata/RHSA-2026:7841
https://access.redhat.com/errata/RHSA-2026:7842
https://access.redhat.com/errata/RHSA-2026:7843
https://access.redhat.com/errata/RHSA-2026:7845
https://access.redhat.com/errata/RHSA-2026:7858
https://access.redhat.com/errata/RHSA-2026:8284
https://access.redhat.com/errata/RHSA-2026:8285
https://access.redhat.com/errata/RHSA-2026:8286
https://access.redhat.com/errata/RHSA-2026:8287
https://access.redhat.com/errata/RHSA-2026:8288
https://access.redhat.com/errata/RHSA-2026:8289
https://access.redhat.com/errata/RHSA-2026:8290
https://access.redhat.com/errata/RHSA-2026:8315
https://access.redhat.com/errata/RHSA-2026:8427
https://access.redhat.com/errata/RHSA-2026:8850
https://access.redhat.com/security/cve/CVE-2026-4687
https://bugzilla.redhat.com/show_bug.cgi?id=2450757
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4687.json
Configurations

Configuration 1 (hide)

OR cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*

History

30 Jun 2026, 03:20

Type Values Removed Values Added
CWE CWE-501
References
  • () https://access.redhat.com/errata/RHSA-2026:5930 -
  • () https://access.redhat.com/errata/RHSA-2026:5931 -
  • () https://access.redhat.com/errata/RHSA-2026:5932 -
  • () https://access.redhat.com/errata/RHSA-2026:6188 -
  • () https://access.redhat.com/errata/RHSA-2026:6342 -
  • () https://access.redhat.com/errata/RHSA-2026:6917 -
  • () https://access.redhat.com/errata/RHSA-2026:7837 -
  • () https://access.redhat.com/errata/RHSA-2026:7838 -
  • () https://access.redhat.com/errata/RHSA-2026:7839 -
  • () https://access.redhat.com/errata/RHSA-2026:7840 -
  • () https://access.redhat.com/errata/RHSA-2026:7841 -
  • () https://access.redhat.com/errata/RHSA-2026:7842 -
  • () https://access.redhat.com/errata/RHSA-2026:7843 -
  • () https://access.redhat.com/errata/RHSA-2026:7845 -
  • () https://access.redhat.com/errata/RHSA-2026:7858 -
  • () https://access.redhat.com/errata/RHSA-2026:8284 -
  • () https://access.redhat.com/errata/RHSA-2026:8285 -
  • () https://access.redhat.com/errata/RHSA-2026:8286 -
  • () https://access.redhat.com/errata/RHSA-2026:8287 -
  • () https://access.redhat.com/errata/RHSA-2026:8288 -
  • () https://access.redhat.com/errata/RHSA-2026:8289 -
  • () https://access.redhat.com/errata/RHSA-2026:8290 -
  • () https://access.redhat.com/errata/RHSA-2026:8315 -
  • () https://access.redhat.com/errata/RHSA-2026:8427 -
  • () https://access.redhat.com/errata/RHSA-2026:8850 -
  • () https://access.redhat.com/security/cve/CVE-2026-4687 -
  • () https://bugzilla.redhat.com/show_bug.cgi?id=2450757 -
  • () https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4687.json -

13 Apr 2026, 15:17

Type Values Removed Values Added
Summary (en) Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9. (en) Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

25 Mar 2026, 15:16

Type Values Removed Values Added
CWE CWE-120
Summary
  • (es) Escape de sandbox debido a condiciones de límite incorrectas en el componente de Telemetría. Esta vulnerabilidad afecta a Firefox &lt; 149, Firefox ESR &lt; 115.34, Firefox ESR &lt; 140.9, Thunderbird &lt; 149, y Thunderbird &lt; 140.9.

24 Mar 2026, 21:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-23/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-24/ -
Summary (en) Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9. (en) Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, Firefox ESR < 140.9, Thunderbird < 149, and Thunderbird < 140.9.

24 Mar 2026, 19:17

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown
v2 : unknown
v3 : 8.6
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
CWE CWE-754
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2016368 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2016368 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-20/ - () https://www.mozilla.org/security/advisories/mfsa2026-20/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-21/ - () https://www.mozilla.org/security/advisories/mfsa2026-21/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-22/ - () https://www.mozilla.org/security/advisories/mfsa2026-22/ - Vendor Advisory
First Time Mozilla
Mozilla firefox

24 Mar 2026, 13:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-03-24 13:16

Updated : 2026-07-15 02:22


NVD link : CVE-2026-4687

Mitre link : CVE-2026-4687

CVE.ORG link : CVE-2026-4687


JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-754

Improper Check for Unusual or Exceptional Conditions

CWE-120

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-501

Trust Boundary Violation