CVE-2026-2776
10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Summary
Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 115.33 <= 115.* | unaffected |
| Mozilla | Firefox | 140.8 <= 140.* | unaffected |
| Mozilla | Firefox | 148 <= * | unaffected |
| Mozilla | Thunderbird | 140.8 <= 140.* | unaffected |
| Mozilla | Thunderbird | 148 <= * | unaffected |
Weaknesses
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: yes
- Technical Impact: total
firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software
Additional References
- https://access.redhat.com/security/cve/CVE-2026-2776
- https://bugzilla.redhat.com/show_bug.cgi?id=2442291
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2776.json
- https://access.redhat.com/errata/RHSA-2026:3984
- https://access.redhat.com/errata/RHSA-2026:3976
- https://access.redhat.com/errata/RHSA-2026:4260
- https://access.redhat.com/errata/RHSA-2026:3361
- https://access.redhat.com/errata/RHSA-2026:3517
- https://access.redhat.com/errata/RHSA-2026:3338
- https://access.redhat.com/errata/RHSA-2026:3515
- https://access.redhat.com/errata/RHSA-2026:3492
- https://access.redhat.com/errata/RHSA-2026:4432
- https://access.redhat.com/errata/RHSA-2026:3491
- https://access.redhat.com/errata/RHSA-2026:3980
- https://access.redhat.com/errata/RHSA-2026:3495
- https://access.redhat.com/errata/RHSA-2026:3979
- https://access.redhat.com/errata/RHSA-2026:3494
- https://access.redhat.com/errata/RHSA-2026:4022
- https://access.redhat.com/errata/RHSA-2026:3493
- https://access.redhat.com/errata/RHSA-2026:3983
- https://access.redhat.com/errata/RHSA-2026:4152
- https://access.redhat.com/errata/RHSA-2026:3978
- https://access.redhat.com/errata/RHSA-2026:3496
- https://access.redhat.com/errata/RHSA-2026:3981
- https://access.redhat.com/errata/RHSA-2026:3497
- https://access.redhat.com/errata/RHSA-2026:3982
- https://access.redhat.com/errata/RHSA-2026:3339
- https://access.redhat.com/errata/RHSA-2026:3516
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2015266
- https://www.mozilla.org/security/advisories/mfsa2026-13/
- https://www.mozilla.org/security/advisories/mfsa2026-14/
- https://www.mozilla.org/security/advisories/mfsa2026-15/
- https://www.mozilla.org/security/advisories/mfsa2026-16/
- https://www.mozilla.org/security/advisories/mfsa2026-17/
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