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Mozilla Firefox CVE-2026-16409

| EUVDEUVD-2026-46247 HIGH
Access of Uninitialized Pointer (CWE-824)
2026-07-21 mozilla GHSA-gcmc-83gc-jhq6
Memory Corruption Mozilla Information Disclosure Red Hat
High
Disputed · 7.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–Critical)
Vendor (mozilla) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network-delivered content triggers the crash but a browser client must load it, so UI:R rather than UI:N; impact is a process crash only, hence C:N/I:N and A:H.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
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
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 21:11 vuln.today
CVSS changed
Jul 22, 2026 - 19:22 NVD
7.5 (HIGH)
CVE Published
Jul 21, 2026 - 12:38 cve.org
HIGH 7.5
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Invalid pointer in the Security: PSM component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Denial of service in Mozilla Firefox before version 153 arises from an invalid pointer access (CWE-824) in the PSM (Personal Security Manager) security component, which brokers TLS/certificate and NSS cryptographic operations. Remote content processed by the browser can trigger the invalid pointer dereference, crashing the affected process; the assigned CVSS 3.1 vector scopes impact to availability only (A:H) with no confidentiality or integrity loss. There is no public exploit identified at time of analysis, and the EPSS probability is low at 0.13% (3rd percentile), consistent with a stability/crash bug rather than a code-execution primitive.

Technical ContextAI

The flaw lives in Firefox's Security: PSM subsystem - the Personal Security Manager that fronts Mozilla's Network Security Services (NSS) for TLS handshakes, certificate validation, and PKCS handling. CWE-824 (Access of Uninitialized/Invalid Pointer) means code follows a pointer that was never properly initialized or has become invalid, leading to a memory access at an unintended address. In a browser the practical result is typically a process crash rather than controlled corruption, though Mozilla's own tags additionally label the class as 'Memory Corruption' and 'Information Disclosure,' hinting the root cause touches cryptographic/certificate parsing paths reachable from network-supplied data. The single CPE, cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, indicates all Firefox builds prior to the fixed release are in scope.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox installations to version 153 or later, which is the primary and complete remediation. Enterprises should push the update through their managed browser deployment mechanism (Group Policy/ADMX, MDM, or the internal update service) and confirm the corresponding ESR channel fix via the advisories before relying on ESR. Consult https://www.mozilla.org/security/advisories/mfsa2026-68/ and https://www.mozilla.org/security/advisories/mfsa2026-71/ for authoritative fixed-version details. No official workaround is published; because the trigger is malicious web content, an interim compensating control is to restrict browsing to trusted sites via web proxy/URL filtering and to keep users off untrusted pages until patched - this reduces exposure but degrades normal browsing and does not address the root cause, so it is a stopgap only until version 153 is deployed.

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Same weakness CWE-824 – Access of Uninitialized Pointer

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6.5
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Same technique Memory Corruption

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8.8
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8.8
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7.8

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-2026-16409 vulnerability details – vuln.today
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