DEBIAN-CVE-2026-4687

Advisory lineage Upstream: 1 Downstream: 4
Upstream
CVE-2026-4687
Published: 24 Mar 2026, 13:16
Last modified:28 Apr 2026, 20:31

Vulnerability Summary

Overall Risk (default)
medium
34/100
CVSS Score
8.6 HIGH
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

24 Mar 2026, 13:16
Published
Vulnerability first disclosed
28 Apr 2026, 20:31
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v3.1•HIGH•Score: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected Systems

  • debian•firefox-esr

    all | all | all | all | < 140.9.0esr-1~deb11u1 | < 140.9.0esr-1~deb12u1 | < 140.9.0esr-1~deb13u1 | < 140.9.0esr-1

  • debian•thunderbird

    all | all | all | all | < 1:140.9.0esr-1~deb11u1 | < 1:140.9.0esr-1~deb12u1 | < 1:140.9.0esr-1~deb13u1 | < 1:140.9.0esr-1

References (1)