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Mozilla Firefox CVE-2026-16411

| EUVDEUVD-2026-46249 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-jxhp-8w98-jhcf
RCE Buffer Overflow Red Hat Mozilla
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Web-borne browser bug requires the victim to visit a page (UI:R) and reliable memory-corruption exploitation is non-trivial against sandbox/mitigations (AC:H); full CIA impact on code execution.

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
CRITICAL
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

4
Analysis Generated
Jul 21, 2026 - 20:25 vuln.today
CVSS changed
Jul 21, 2026 - 20:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.8

DescriptionCVE.org

Memory safety bugs present in Firefox 152. 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 153.

AnalysisAI

Memory corruption in Mozilla Firefox 152 lets a remote attacker who lures a victim to a malicious web page trigger memory-safety violations that Mozilla assesses could be leveraged for arbitrary code execution. The flaw is one of a batch of internally-discovered memory safety bugs (CWE-119) rolled up under MFSA2026-68 and carries a CVSS 9.8 rating; there is no public exploit identified at time of analysis, and it is fixed in Firefox 153.

Technical ContextAI

Firefox is built largely in C++, a memory-unsafe language, and this issue stems from CWE-119 (improper restriction of operations within the bounds of a memory buffer) - the buffer-overflow/out-of-bounds class that underlies most browser memory-corruption bugs. Mozilla's advisory bundles many individual Bugzilla entries (referenced bug IDs such as 1420800, 2050871, 2052060, etc.) into a single 'memory safety bugs' CVE, a routine practice for defects found via fuzzing and internal auditing where at least some showed evidence of memory corruption. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the desktop Firefox application is the affected component; corruption is typically reachable through the content/rendering engine when parsing untrusted web content (JavaScript, layout, media, or DOM handling).

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox 152 installations to version 153 or later, which Mozilla states fixes these memory safety bugs; details are in advisory https://www.mozilla.org/security/advisories/mfsa2026-68/. Firefox auto-updates by default, so ensure automatic updates are enabled and force an update check (Help > About Firefox) or push the new build through enterprise management (Group Policy/ADMX, MDM, or the enterprise .msi/.pkg) for managed fleets. No standalone patch exists for the browser engine itself, so version upgrade is the only true fix; as an interim compensating control for high-risk users, restricting browsing to trusted sites and disabling JavaScript on untrusted pages (e.g., via NoScript or reader mode) reduces the attack surface, at the cost of breaking most modern web functionality. Verify ESR/Thunderbird channels against their own Mozilla advisories if those are in use.

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Same weakness CWE-119 – Buffer Overflow

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Same technique RCE

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
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
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16411 vulnerability details – vuln.today
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