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Mozilla Firefox CVE-2026-12310

| EUVDEUVD-2026-37101 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-9652-j9gr-w3mm
Buffer Overflow Mozilla
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Medium–Critical)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Remote via malicious page (AV:N/AC:L), no privileges, but rendering attacker content realistically needs victim action so UI:R; impact limited to memory disclosure (C:H, I:N/A:N).

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

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:42 vuln.today
CVE Published
Jun 16, 2026 - 11:52 cve.org
HIGH 7.5
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

AnalysisAI

Memory-corruption in Mozilla Firefox before version 152 (and Firefox ESR before 140.12) allows a remote, unauthenticated attacker to trigger a memory safety bug via a malicious web page; the CVSS vector's confidentiality-only impact indicates likely out-of-bounds memory disclosure rather than full code execution. The flaw was reported and patched by Mozilla in advisories MFSA2026-57/58/60/61 and is fixed in Firefox 152 / ESR 140.12. There is no public exploit identified at time of analysis, EPSS is low (0.27%, 18th percentile), and CISA SSVC lists exploitation as 'none', though the bug is assessed as automatable.

Technical ContextAI

The affected component is Mozilla Firefox's browser engine (Gecko), specifically native C/C++ code paths that process untrusted web content. The root cause is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a classic buffer boundary violation reinforced by the 'Buffer Overflow' tag. Mozilla groups such issues as 'memory safety bugs' - conditions that in the general case can corrupt memory, but here the provided CVSS vector (C:H/I:N/A:N) points to an out-of-bounds read / information-disclosure primitive rather than arbitrary code execution or a crash. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, and downstream distributors Red Hat and SUSE (per the tags) repackage the same engine, widening the affected surface.

RemediationAI

Vendor-released patch: upgrade to Mozilla Firefox 152 or Firefox ESR 140.12, which contain the fix per Mozilla advisories MFSA2026-57/58/60/61 (https://www.mozilla.org/security/advisories/mfsa2026-57/ and mfsa2026-58/60/61). Enterprise and Linux users relying on distribution packages should apply the corresponding Red Hat and SUSE security updates once published, since those builds track the same engine. As no meaningful in-product configuration workaround exists for a native memory bug, interim compensating controls are limited to reducing exposure to untrusted content: restrict browsing to trusted sites via web proxy/URL filtering (trade-off: breaks general browsing), and disable or sandbox JavaScript/rich content on high-value hosts via enterprise policy (trade-off: significant usability loss). These controls only lower likelihood, not eliminate the flaw, so patching is the authoritative fix.

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Same weakness CWE-119 – Buffer Overflow

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CVE-2020-0796 CRITICAL POC
10.0
CVE-2017-11882 HIGH POC
7.8
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CVE-2015-2426 HIGH POC
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CVE-2013-3918 HIGH POC
8.8
CVE-2023-4966 HIGH POC
7.5
CVE-2017-11774 HIGH POC
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CVE-2013-3660 HIGH POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
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CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

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-2026-12310 vulnerability details – vuln.today
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