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Mozilla Firefox CVE-2026-84144

| EUVDEUVD-2026-69092 HIGH
Buffer Overflow (CWE-119)
2026-09-01 mozilla GHSA-458m-m9vv-frq3
Buffer Overflow Mozilla Suse
7.5
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
vuln.today AI
7.5 HIGH

Browser memory corruption requires active user navigation (UI:R) and overcoming heap/ASLR mitigations (AC:H); full-compromise triad C:H/I:H/A:H is plausible for RCE-class bugs within the browser process.

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
HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Sep 03, 2026 - 16:24 vuln.today
CVSS changed
Sep 03, 2026 - 16:22 NVD
7.5 (HIGH)
CVE Published
Sep 01, 2026 - 12:19 cve.org
UNKNOWN (no severity yet)
CVE Published
Sep 01, 2026 - 12:19 cve.org
HIGH 7.5

DescriptionCVE.org

Internally found bugs present in Firefox 154 and Firefox ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.

AnalysisAI

Memory safety vulnerabilities across multiple internally discovered bugs in Firefox 154 and Firefox ESR 153.1 allow network-based attackers to potentially achieve full browser compromise through memory corruption (CWE-119). Mozilla's own advisory clusters dozens of individual Bugzilla reports - including buffer overflows and related defects - under a single advisory umbrella, noting that sufficiently motivated attackers could likely exploit some of these bugs. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires user interaction: a victim must actively browse to an attacker-controlled or compromised web page in an unpatched Firefox 154 or Firefox ESR 153.1 (or earlier) instance (UI:R). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 7.5 with vector AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H reflects that successful exploitation requires overcoming high-complexity memory layout or race-condition constraints (AC:H) and user interaction to visit a malicious page (UI:R), tempering the raw C:H/I:H/A:H triad. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: Firefox 155 (release channel) and Firefox ESR 153.2. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: identify and inventory all systems running Firefox 154 or Firefox ESR 153.1 using device management or asset discovery tools; prepare deployment packages for Firefox 155 and Firefox ESR 153.2. …

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Important
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-2026-84144 vulnerability details – vuln.today
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