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Mozilla Firefox CVE-2026-12305

| EUVDEUVD-2026-37096 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-2x28-ghj8-5fhc
Mozilla Buffer Overflow Red Hat Suse
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:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Remote web content reaches the bug (AV:N, AC:L, PR:N), but a user must load the malicious page so UI:R; impact is a process crash, so only A:H.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/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

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

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 19:24 vuln.today
CVSS changed
Jun 16, 2026 - 19:22 NVD
7.5 (HIGH)
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

Denial of service in Mozilla Firefox prior to version 152 and Firefox ESR prior to 140.12 stems from a memory safety bug (CWE-119) that remote attackers can trigger via crafted web content. The CVSS 7.5 score reflects high availability impact with no confidentiality or integrity loss, consistent with a browser crash rather than reliable code execution. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker hosts malicious web page
Delivery
Lures victim to URL
Exploit
Gecko parses crafted content
Execution
Memory corruption in Firefox process
Impact
Browser crash and DoS
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to load attacker-controlled web content in an unpatched Firefox (< 152) or Firefox ESR (< 140.12) - for example by visiting a malicious URL, opening a hostile HTML email rendered by Gecko, or loading a compromised third-party resource on an otherwise trusted page. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) describes an unauthenticated, network-reachable, low-complexity attack with availability-only impact - consistent with a browser tab or process crash triggered by hostile web content. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker hosts a malicious web page (or compromises a third-party ad/script loaded by a legitimate site) containing crafted content that triggers the memory-corruption condition in Firefox's rendering or media stack. When a victim with an unpatched Firefox visits the page, the browser process crashes, causing loss of the user's browsing session and tabs; with additional research a determined attacker could attempt to escalate the corruption toward code execution, though no such exploit is publicly identified at time of analysis.
Remediation Vendor-released patch: upgrade desktop Firefox to version 152 or later and Firefox ESR to 140.12 or later, per Mozilla advisories MFSA2026-57/58/60/61 at https://www.mozilla.org/security/advisories/. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 24 hours: Identify all Firefox deployments across managed and unmanaged devices. …

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Same weakness CWE-119 – Buffer Overflow

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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-2026-12305 vulnerability details – vuln.today
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