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Mozilla Firefox EUVDEUVD-2026-37076

| CVE-2026-12330 MEDIUM
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-jrcp-wwfg-qhjg
Buffer Overflow Mozilla
Medium
Disputed · 5.4 Vendor: mozilla
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Severity by source

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

Network-delivered via browser, no privileges needed, but user must visit malicious content; impact is limited memory read/write within browser process only.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

3
Analysis Generated
Jul 23, 2026 - 16:38 vuln.today
CVE Published
Jun 16, 2026 - 11:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 16, 2026 - 11:53 cve.org
MEDIUM 5.4

DescriptionCVE.org

Incorrect boundary conditions in the Internationalization component. This vulnerability was fixed in Firefox ESR 140.12 and Firefox ESR 115.37.

AnalysisAI

Incorrect boundary conditions in Mozilla Firefox's Internationalization component allow a network-accessible attacker to cause limited memory corruption, resulting in partial confidentiality and integrity compromise. Affected versions include all Firefox ESR releases prior to 140.12 and 115.37; vendor-released patches are available in both ESR branches. No public exploit has been identified at time of analysis, CISA has not added this to its Known Exploited Vulnerabilities catalog, and EPSS scores exploitation probability at a very low 0.16% (6th percentile), suggesting limited real-world attacker interest.

Technical ContextAI

CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates that the root cause is a classic boundary-check failure - the code reads or writes memory outside an intended buffer region. The vulnerable component is Firefox's Internationalization (i18n) subsystem, which handles Unicode string processing, locale data, character encoding normalization, and related operations via libraries such as ICU (International Components for Unicode). Boundary errors in i18n code commonly occur when processing specially crafted locale strings, Unicode code points, or language tags that exceed expected buffer sizes. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the entire Firefox application product line is in scope. Red Hat and SUSE tags in the intelligence feed indicate downstream Linux distribution packages are also affected, widening the remediation surface beyond direct Mozilla installs.

RemediationAI

Upgrade to Firefox ESR 140.12 or Firefox ESR 115.37, the vendor-confirmed fixed releases per Mozilla security advisories mfsa2026-58, mfsa2026-59, and mfsa2026-61 (https://www.mozilla.org/security/advisories/mfsa2026-58/). Red Hat and SUSE users should apply updated packages from their respective vendor channels as patched RPMs and RPM-based packages will follow the upstream ESR fix. If immediate upgrade is not possible, a compensating control is to restrict or disable JavaScript execution for untrusted sites via browser security settings, which reduces the attack surface for i18n component triggering - note this will break legitimate functionality on many sites. Enterprise environments can enforce browser version policy via MDM or Group Policy to prevent users from running unpatched ESR versions. Full details and the upstream bug report are available at https://bugzilla.mozilla.org/show_bug.cgi?id=2029326.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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8.8
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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-2026-37076 vulnerability details – vuln.today
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