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Mozilla Firefox CVE-2026-15718

| EUVDEUVD-2026-43662 MEDIUM
Release of Invalid Pointer or Reference (CWE-763)
2026-07-14 mozilla GHSA-6f82-p732-9cp8
Information Disclosure Red Hat Mozilla Suse
4.3
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
vuln.today AI
4.3 MEDIUM

Network-delivered browser flaw requiring user navigation (UI:R, PR:N); impact confined to limited memory read with no integrity or availability effect.

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
MEDIUM
qualitative
Red Hat
8.8 MEDIUM
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

4
Analysis Generated
Jul 14, 2026 - 15:05 vuln.today
CVSS changed
Jul 14, 2026 - 14:22 NVD
4.3 (MEDIUM)
CVE Published
Jul 14, 2026 - 12:15 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 14, 2026 - 12:15 cve.org
MEDIUM 4.3

DescriptionCVE.org

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6.

AnalysisAI

Information disclosure in Mozilla Firefox via CWE-763 (Release of Invalid Pointer or Reference) allows network-based attackers to read limited memory contents from affected browser instances. All Firefox versions prior to 152.0.6 are affected. Publicly available exploit code exists, though Mozilla reports no confirmed attacks in the wild; user interaction is required to trigger the flaw, moderately reducing real-world exposure.

Technical ContextAI

CWE-763 describes a condition where a program releases a pointer that does not point to valid, allocated memory - a class of memory-safety bug common in C/C++ codebases like Firefox's Gecko engine. When an invalid or already-freed pointer is passed to a deallocation routine, or when a dangling reference is dereferenced, the resulting behavior can leak adjacent heap or stack memory contents to an attacker. In a browser context, this can expose data from other browser memory regions such as credentials, DOM content, or internal structures. The affected product is identified via CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering all Firefox releases across platforms until the fix was introduced in 152.0.6.

RemediationAI

Upgrade to Firefox 152.0.6 or later, which is confirmed by Mozilla as the patched release per the advisory at https://www.mozilla.org/security/advisories/mfsa2026-67/ and the associated Bugzilla report at https://bugzilla.mozilla.org/show_bug.cgi?id=2045443. For enterprise environments unable to update immediately, disabling JavaScript or restricting navigation to known-trusted sites via content filtering reduces exposure by limiting the ability of attackers to deliver crafted content. Note that disabling JavaScript broadly will significantly impact browser usability. Browser sandboxing controls (e.g., enforcing OS-level sandbox policies) may limit the data accessible via a memory leak but do not eliminate the vulnerability. Auto-update should be verified as enabled for end-user systems given the availability of public exploit code.

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Vendor StatusVendor

SUSE

Severity: Moderate
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-2026-15718 vulnerability details – vuln.today
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