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Mozilla Firefox CVE-2026-12318

| EUVDEUVD-2026-37109 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-6q4q-pwxf-8h4v
Mozilla Buffer Overflow Suse Red Hat
High
Disputed · 7.3 Vendor: mozilla
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Severity by source

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

Network-delivered via crafted TLS/cert data, but realistic exploitation requires the user to navigate to attacker content, so UI:R; no authentication needed; low C/I/A consistent with a boundary error not shown to yield RCE.

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

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

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 19:26 vuln.today
CVSS changed
Jun 16, 2026 - 19:22 NVD
7.3 (HIGH)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Incorrect boundary conditions in the Libraries component in NSS. This vulnerability was fixed in Firefox 152.

AnalysisAI

Memory corruption in the NSS (Network Security Services) Libraries component shipped with Mozilla Firefox allows remote attackers to trigger out-of-bounds memory access via incorrect boundary condition handling, with low impact across confidentiality, integrity, and availability. Mozilla addressed the issue in Firefox 152, with associated advisories MFSA2026-57 and MFSA2026-60. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker stands up malicious HTTPS site
Delivery
Victim loads page in pre-152 Firefox
Exploit
NSS parses crafted certificate or crypto blob
Execution
Incorrect boundary check triggers out-of-bounds access
Persist
Memory corruption in content process
Impact
Limited info disclosure or instability
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to use Mozilla Firefox at a version earlier than 152 and to process attacker-influenced cryptographic data through NSS - in practice this means establishing a TLS connection to, or loading a certificate/cryptographic resource from, an attacker-controlled or attacker-influenced endpoint. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 base score of 7.3 (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L) reflects a network-reachable, unauthenticated, no-user-interaction-required flaw with low impact on each of confidentiality, integrity and availability - typical of a memory boundary issue whose exact exploitability has not been demonstrated to reach full code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious website or compromises an ad network to serve a crafted TLS certificate chain or cryptographic payload that triggers the NSS boundary error when a victim's pre-152 Firefox browser parses it. The resulting memory corruption could leak small amounts of process memory or destabilize the content process, and with additional unpatched primitives chained in could escalate toward sandboxed code execution; no public exploit is identified at time of analysis.
Remediation Vendor-released patch: Firefox 152. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Determine Firefox deployment scope across your organization and identify systems requiring patching. …

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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
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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CVE-2026-12318 vulnerability details – vuln.today
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