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Mozilla Firefox CVE-2026-12317

| EUVDEUVD-2026-37108 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-5f8v-42g3-h2jr
Mozilla Buffer Overflow Suse Red Hat
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–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

Browser memory bug triggered by visiting attacker content, so AV:N/AC:L/PR:N with UI:R for page navigation; confirmed impact is crash-only, hence C:N/I:N/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:P/VC:N/VI:N/VA:H/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: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 - 19:25 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.

AnalysisAI

Memory corruption in Mozilla Firefox versions prior to 152 allows remote unauthenticated attackers to crash the browser by serving crafted web content, resulting in denial of service. The CVSS 3.1 base score of 7.5 reflects high availability impact without confidentiality or integrity loss, and no public exploit identified at time of analysis. Mozilla disclosed the issue via advisories MFSA2026-57 and MFSA2026-60 with a fix shipped in Firefox 152.

Technical ContextAI

The flaw is classified as CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a buffer-handling weakness in Firefox's native C++ codebase - likely within the rendering, JavaScript, or media subsystems where Mozilla historically batches 'memory safety bugs' that show evidence of memory corruption. The affected CPE is cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* covering all Firefox versions prior to 152. Mozilla typically rates such bugs as potentially exploitable for arbitrary code execution given sufficient effort, though the assigned CVSS vector here reflects only confirmed availability impact (crash).

RemediationAI

Vendor-released patch: Firefox 152 - upgrade all Firefox installations to 152 or later as the primary remediation, following Mozilla's advisories at https://www.mozilla.org/security/advisories/mfsa2026-57/ and https://www.mozilla.org/security/advisories/mfsa2026-60/. There is no documented configuration workaround for memory safety bugs of this class; as compensating controls before patching, organizations can restrict browsing to trusted sites via web filtering or proxy allowlists (trade-off: breaks general web usage), enforce strict site isolation and disable JavaScript on untrusted origins via enterprise policy (trade-off: many sites become non-functional), or temporarily route users to an alternative already-patched browser (trade-off: workflow disruption and bookmark/profile loss). Verify update rollout through enterprise policy mechanisms such as Mozilla's ADMX/policies.json.

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Same weakness CWE-119 – Buffer Overflow

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8.8
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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-2026-12317 vulnerability details – vuln.today
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