CVE-2026-12297
published 2026-06-16CVE-2026-12297: Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR…
PriorityP348critical9.6CVSS 3.1
AVNACLPRNUIRSCCHIHAH
EPSS
0.39%
31.4th percentile
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Affected
14 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | firefox | < 115.37.0 | 115.37.0 |
| mozilla | firefox | < 152.0.0 | 152.0.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 128.0 < 140.12.0 | 140.12.0 |
| mozilla | firefox_esr | < Firefox ESR 140.12 | Firefox ESR 140.12 |
| mozilla | firefox_esr | < Firefox ESR 115.37 | Firefox ESR 115.37 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | < 140.12.0 | 140.12.0 |
| mozilla | thunderbird | < 152.0.0 | 152.0.0 |
| mozilla | thunderbird | — | — |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.19.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking component
vendor_redhat·2026-06-16·CVSS 7.5
CVE-2026-12297 [HIGH] CWE-653 firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking component
firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Networking component
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Sandbox escape due to incorrect boundary conditions in the Networking component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12297
vendor_mozilla
CVE-2026-12297 Mozilla Foundation Security Advisory 2026-57: CVE-2026-12297
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12297
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12297
vendor_mozilla
CVE-2026-12297 Mozilla Foundation Security Advisory 2026-58: CVE-2026-12297
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12297
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-59: CVE-2026-12297
vendor_mozilla
CVE-2026-12297 Mozilla Foundation Security Advisory 2026-59: CVE-2026-12297
Mozilla Foundation Security Advisory 2026-59
CVE: CVE-2026-12297
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.37
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12297
vendor_mozilla
CVE-2026-12297 Mozilla Foundation Security Advisory 2026-60: CVE-2026-12297
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12297
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12297
vendor_mozilla
CVE-2026-12297 Mozilla Foundation Security Advisory 2026-61: CVE-2026-12297
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12297
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
VulDB
Mozilla Firefox up to 151 Networking sandbox (Nessus ID 321490 / WID-SEC-2026-1959)
vuldb·2026-07-03·CVSS 9.6
CVE-2026-12297 [CRITICAL] Mozilla Firefox up to 151 Networking sandbox (Nessus ID 321490 / WID-SEC-2026-1959)
A vulnerability was found in Mozilla Firefox up to 151. It has been declared as critical. The affected element is an unknown function of the component Networking. Such manipulation leads to sandbox issue.
This vulnerability is referenced as CVE-2026-12297. It is possible to launch the attack remotely. No exploit is available.
It is recommended to upgrade the affected component.
GHSA
Sandbox escape due to incorrect boundary conditions in the Networking component.
ghsa_unreviewed·2026-06-16
CVE-2026-12297 Sandbox escape due to incorrect boundary conditions in the Networking component.
Sandbox escape due to incorrect boundary conditions in the Networking component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2041610https://www.mozilla.org/security/advisories/mfsa2026-57/https://www.mozilla.org/security/advisories/mfsa2026-58/https://www.mozilla.org/security/advisories/mfsa2026-59/https://www.mozilla.org/security/advisories/mfsa2026-60/https://www.mozilla.org/security/advisories/mfsa2026-61/https://access.redhat.com/errata/RHSA-2026:27717https://access.redhat.com/errata/RHSA-2026:27733https://access.redhat.com/errata/RHSA-2026:27734https://access.redhat.com/errata/RHSA-2026:29940https://access.redhat.com/errata/RHSA-2026:30846https://access.redhat.com/errata/RHSA-2026:33445https://access.redhat.com/errata/RHSA-2026:36100https://access.redhat.com/errata/RHSA-2026:36101https://access.redhat.com/errata/RHSA-2026:36102https://access.redhat.com/errata/RHSA-2026:36103https://access.redhat.com/errata/RHSA-2026:37210https://access.redhat.com/errata/RHSA-2026:37391https://access.redhat.com/errata/RHSA-2026:38506https://access.redhat.com/errata/RHSA-2026:38750https://access.redhat.com/errata/RHSA-2026:38751https://access.redhat.com/errata/RHSA-2026:38753https://access.redhat.com/security/cve/CVE-2026-12297https://bugzilla.redhat.com/show_bug.cgi?id=2489235https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-12297.json
2026-06-16
Published