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Mozilla Firefox CVE-2026-12328

| EUVDEUVD-2026-37074 HIGH
Classic Buffer Overflow (CWE-120)
2026-06-16 mozilla GHSA-gff2-447q-xjx8
RCE Mozilla Buffer Overflow
8.1
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Browser memory-corruption requires victim to load malicious content (UI:R) and Mozilla notes non-trivial effort to weaponize (AC:H); no auth needed and full content-process impact yields C/I/A:H.

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

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 15:36 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
8.1 (HIGH)
CVE Published
Jun 16, 2026 - 11:53 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, and Firefox ESR 115.37.

Articles & Coverage 1

News 5 New Mozilla Vulnerabilities - 5 High Severity, No Public POC Jun 16, 2026

AnalysisAI

Memory corruption vulnerabilities in Mozilla Firefox 151, Firefox ESR 115.36/140.11, and Thunderbird 151/ESR 140.11 allow remote attackers to potentially execute arbitrary code by serving crafted web content that triggers internal memory safety bugs. Mozilla developers observed evidence of memory corruption in several of these bugs and assess that sufficient effort could yield arbitrary code execution in the browser process. No public exploit identified at time of analysis, and SSVC reports no observed exploitation, but the high CVSS (8.1) and total technical impact warrant prompt patching.

Technical ContextAI

The flaw class is CWE-120 (classic buffer overflow / improper buffer length handling) within Mozilla's Gecko rendering and JavaScript engines shared by Firefox and Thunderbird. CPE cpe:2.3:a:mozilla:firefox covers all Firefox builds prior to the fixed releases; Thunderbird is affected because it reuses Gecko for message rendering. These are aggregate memory-safety advisories (mfsa2026-57/58/59) that bundle multiple internal Bugzilla findings (bugs 2029402, 2038477, 2039726, 2041373, 2042268, 2042451, 2042782, 2042858, 2042929, 2042965, 2043213) discovered through fuzzing and developer review, where some showed concrete memory corruption signals such as heap or stack out-of-bounds writes.

RemediationAI

Vendor-released patch: upgrade to Firefox 152, Firefox ESR 140.12, or Firefox ESR 115.37; Thunderbird users should update to the corresponding fixed Thunderbird release aligned with ESR 140.12. Apply enterprise deployment of these builds via mozilla.org/security/advisories/mfsa2026-57, mfsa2026-58, and mfsa2026-59. As compensating controls until patching completes, restrict browsing to trusted internal sites via proxy allowlisting (trade-off: breaks general internet use), enforce strict site isolation and sandboxing policies which are on by default in modern Firefox, and disable JavaScript in Thunderbird message display via the mail.display.disable_format_check / javascript.enabled prefs to reduce Gecko parsing surface (trade-off: breaks some HTML messages and embedded content rendering).

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Same weakness CWE-120 – Classic Buffer Overflow

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Same technique RCE

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CVE-2021-22205 CRITICAL POC
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-12328 vulnerability details – vuln.today
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