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Mozilla Firefox EUVDEUVD-2026-37073

| CVE-2026-12327 HIGH
Buffer Overflow (CWE-119)
2026-06-16 mozilla GHSA-98hp-r9fw-7cc3
RCE Buffer Overflow Mozilla
High
Disputed · 7.3 Vendor: mozilla
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Severity by source

Sources disagree (Medium–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
7.5 HIGH

Remote but requires victim to load malicious content (UI:R) and non-trivial effort to weaponize memory corruption (AC:H); presumed arbitrary code execution yields full C/I/A impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
8.1 CRITICAL
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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: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
Jul 23, 2026 - 16:39 vuln.today
CVE Published
Jun 16, 2026 - 11:53 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 16, 2026 - 11:53 cve.org
HIGH 7.3

DescriptionCVE.org

Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.

Articles & Coverage 1

News 5 New Mozilla Vulnerabilities - 5 High Severity, No Public POC Jun 16, 2026

AnalysisAI

Memory-corruption flaws in Mozilla Firefox 151, Firefox ESR 140.11, Thunderbird 151 and Thunderbird ESR 140.11 allow remote attackers to potentially execute arbitrary code by having a victim load maliciously crafted web content. Mozilla's engineers reported evidence of memory corruption in several bundled bugs and presume that, with sufficient effort, at least some could be leveraged for code execution. There is no public exploit identified at time of analysis, EPSS risk is low (0.22%), and the issue is not on CISA KEV; a fix is available in Firefox 152 and Firefox ESR 140.12.

Technical ContextAI

This is a classic Mozilla roll-up advisory (MFSA-2026-57/58/60/61) covering multiple memory safety defects in the shared Gecko browser engine used by both Firefox and Thunderbird, tracked upstream across a dozen Bugzilla entries. The CWE-119 classification (Improper Restriction of Operations within the Bounds of a Memory Buffer) points to buffer over/under-reads and writes in native C/C++ engine code that parses and renders untrusted web content (HTML, CSS, JavaScript/JIT, media, and layout). Because Thunderbird embeds the same Gecko engine to render HTML email, it inherits the same defects. The affected CPE is cpe:2.3:a:mozilla:firefox, and the memory corruption is the type Mozilla routinely hardens against because such bugs are frequently the root of exploitable arbitrary-code-execution primitives when combined with a heap-grooming and sandbox-escape chain.

RemediationAI

Vendor-released patch: upgrade Firefox to 152 and Firefox ESR to 140.12 as the primary fix; apply the corresponding fixed Thunderbird builds from the same release train, and on Red Hat and SUSE systems install the vendor-packaged updates once the distro advisories ship. Consult https://www.mozilla.org/security/advisories/mfsa2026-57/ and mfsa2026-58/60/61 for exact build mappings. Because these are engine memory-safety bugs with no configuration toggle, there is no clean feature-level workaround; if patching must be delayed, reduce exposure by disabling JavaScript in high-risk browsing contexts or via NoScript (breaks most modern sites), and in Thunderbird disable remote content and HTML message rendering / enable plain-text view (degrades email usability but blocks the untrusted-content path). These are mitigations of last resort with significant usability trade-offs, not substitutes for the update.

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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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EUVD-2026-37073 vulnerability details – vuln.today
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