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Mozilla Firefox CVE-2026-12297

| EUVDEUVD-2026-37088 CRITICAL
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-vhm6-gp6v-q659
Mozilla Buffer Overflow
9.6
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
9.6 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vuln.today AI
8.3 HIGH

Network-delivered content reaches the Networking component with no auth (PR:N) but requires the user to load it (UI:R); sandbox escapes are non-trivial chains so AC:H, with full host impact crossing the sandbox boundary (S:C, C/I/A:H).

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SUSE
8.8 CRITICAL
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

3
Analysis Generated
Jun 18, 2026 - 19:39 vuln.today
CVSS changed
Jun 18, 2026 - 19:38 NVD
9.6 (None) 9.6 (CRITICAL)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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.

AnalysisAI

Sandbox escape in Mozilla Firefox and Firefox ESR allows a remote attacker to break out of the browser's content sandbox by exploiting incorrect boundary conditions in the Networking component, leading to full compromise of confidentiality, integrity, and availability on the host. Exploitation requires user interaction (e.g., visiting a malicious page), but with CVSS 9.6 and a scope change, successful exploitation crosses the renderer/host trust boundary. No public exploit identified at time of analysis, and EPSS is low (0.16%), consistent with the SSVC 'Exploitation: none' signal.

Technical ContextAI

The flaw is rooted in CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) inside Firefox's Networking component, which handles parsing and processing of network protocol data fed into the content process. Because Firefox isolates web content in a sandboxed child process, a memory-safety bug reachable from network-delivered data can be chained to escape that sandbox and gain code execution at the privilege of the parent browser process. The CPE 'cpe:2.3:a:mozilla:firefox' confirms the desktop Firefox browser family is impacted, and Mozilla's advisories (MFSA 2026-57 through 2026-61) cover both the mainline Firefox and the long-term Firefox ESR 140 and ESR 115 branches.

RemediationAI

Vendor-released patch: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37 as appropriate for the deployed channel, per Mozilla advisories MFSA 2026-57 through MFSA 2026-61 (https://www.mozilla.org/security/advisories/mfsa2026-57/ and the linked 58/59/60/61 entries). No vendor-published workaround is documented; until updates are deployed, organizations can reduce exposure by enforcing automatic Firefox updates via enterprise policy, restricting browsing of untrusted sites through web filtering or proxy categorization (with the trade-off of false positives on legitimate content), and considering temporary use of an alternate browser for sensitive workflows (with the trade-off of compatibility breakage for Firefox-specific apps). Disabling JavaScript or aggressive content blocking can further shrink the attack surface against networking-triggered bugs but will significantly degrade web compatibility.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Desktop Applications 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed

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CVE-2026-12297 vulnerability details – vuln.today
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