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Mozilla Firefox EUVDEUVD-2026-37098

| CVE-2026-12307 MEDIUM
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-m2jv-hf34-6g5m
Buffer Overflow Mozilla
Medium
Disputed · 5.3 Vendor: mozilla
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Severity by source

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

Browser memory bugs require user to visit a malicious page, so UI:R overrides the provided UI:N; C:L reflects memory read only, I:N and A:N per available impact data.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/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
Low
Integrity
None
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:44 vuln.today
CVE Published
Jun 16, 2026 - 11:52 cve.org
MEDIUM 5.3
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 safety buffer-handling flaw in Mozilla Firefox before version 152 and Firefox ESR before 140.12 enables remote unauthenticated attackers to achieve partial confidentiality impact - likely through memory content disclosure - via a network-accessible attack path requiring no user privileges. No public exploit code has been identified at time of analysis, and CISA has not listed this in the Known Exploited Vulnerabilities catalog. EPSS probability stands at 0.28% (19th percentile), consistent with SSVC's 'exploitation: none' classification, indicating low near-term exploitation likelihood despite the automatable attack path.

Technical ContextAI

CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) is the root cause class, confirmed by the 'Buffer Overflow' tag, meaning Firefox's memory management incorrectly bounds-checks operations on a buffer, permitting out-of-bounds reads or writes. The affected product is Mozilla Firefox across all versions prior to 152, as indicated by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*. Four distinct Mozilla Foundation Security Advisories (mfsa2026-57, mfsa2026-58, mfsa2026-60, mfsa2026-61) reference this fix, suggesting the memory safety issue may be one of a batch of related bugs addressed simultaneously in the Firefox 152 and ESR 140.12 release cycle. Tags referencing Red Hat and SUSE indicate downstream Linux distribution packaging is also affected, requiring separate OS-level patch uptake.

RemediationAI

The primary fix is upgrading to Firefox 152 or Firefox ESR 140.12, both confirmed as patched releases per Mozilla's advisories at https://www.mozilla.org/security/advisories/mfsa2026-57/ and https://www.mozilla.org/security/advisories/mfsa2026-58/. For Red Hat and SUSE enterprise deployments, administrators should apply the respective distribution's updated Firefox package through standard package management rather than relying solely on upstream browser auto-update, as OS-level packages require separate patching cycles. If immediate upgrade is not possible, restricting Firefox deployments to trusted internal networks reduces exposure given the network-accessible attack vector, though this is a limited compensating control for an end-user browser. Enabling Firefox's built-in auto-update mechanism provides the lowest-friction remediation path for consumer and unmanaged deployments. The Bugzilla issue at https://bugzilla.mozilla.org/show_bug.cgi?id=2038133 may provide additional technical detail for patch validation.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC
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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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EUVD-2026-37098 vulnerability details – vuln.today
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