Skip to main content

Mozilla Firefox CVE-2026-16410

| EUVDEUVD-2026-46248 CRITICAL
Access of Resource Using Incompatible Type (Type Confusion) (CWE-843)
2026-07-21 mozilla GHSA-wqgp-6hgv-r9qf
Memory Corruption Mozilla Information Disclosure Red Hat
Critical
Disputed · 9.8 Vendor: mozilla
Share

Severity by source

Sources disagree (Low–Critical)
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
8.8 HIGH

Network-delivered malicious JavaScript with no privileges, but realistically requires the victim to visit attacker content, so UI:R; JIT memory corruption yields high C/I/A within the content process.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/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
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 21:10 vuln.today
CVSS changed
Jul 22, 2026 - 19:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:38 cve.org
CRITICAL 9.8
CVE Published
Jul 21, 2026 - 12:38 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Memory-corrupting type confusion in Firefox's JavaScript JIT engine allows a remote attacker to serve a malicious web page that triggers a JIT miscompilation, corrupting memory to disclose sensitive data or achieve code execution in the content process; Mozilla fixed it in Firefox 153. No public exploit is identified at time of analysis, and the EPSS score is low (0.13%, 3rd percentile), indicating no observed weaponization yet despite the critical 9.8 CVSS rating.

Technical ContextAI

The flaw lives in Firefox's SpiderMonkey JavaScript engine, specifically the Just-In-Time (JIT) compiler that translates hot JavaScript into optimized native machine code. CWE-843 (Access of Resource Using Incompatible Type - 'Type Confusion') is the root-cause class: the JIT makes an incorrect assumption about the type of a JavaScript value and emits machine code that operates on it as the wrong type, producing a miscompilation. Because JIT-generated code runs without the runtime type checks of the interpreter, such miscompilations let attacker-controlled script read or write memory outside intended bounds. The CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* confirms the affected product is the Firefox browser application across versions prior to the 153 fix. Mozilla tags classify the impact as Information Disclosure and Memory Corruption.

RemediationAI

Vendor-released patch: Firefox 153. Upgrade all Firefox installations to version 153 or later, which resolves the JIT miscompilation per Mozilla advisories MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/) and MFSA2026-71 (https://www.mozilla.org/security/advisories/mfsa2026-71/); confirm ESR/mobile fixed versions against Mozilla if those channels are in use. Because Firefox auto-updates, ensure the update mechanism is not disabled by policy and force a restart to apply. As an interim compensating control before patching, disabling the JIT compiler removes the vulnerable code path - set javascript.options.baselinejit, javascript.options.ion, and related prefs to false in about:config (or via enterprise policy), accepting a significant JavaScript performance penalty on heavy web apps; alternatively, restrict browsing to trusted sites or deploy script-blocking (e.g., NoScript) to reduce exposure to attacker-controlled JavaScript, at the cost of breaking sites that depend on scripting.

More in Mozilla

View all
CVE-2015-4495 HIGH POC
8.8 Aug 08

The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote
CVE-2013-1690 HIGH POC
8.8 Jun 26

Mozilla Firefox before 22.0, Firefox ESR 17.x before 17.0.7, Thunderbird before 17.0.7, and Thunderbird ESR 17.x before

CVE-2013-0758 CRITICAL POC
9.3 Jan 13

Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and 17.x before 17.0.2, Thunderbird before 17.0.2, Thunderb
CVE-2013-0753 CRITICAL POC
9.3 Jan 13

Use-after-free vulnerability in the serializeToStream implementation in the XMLSerializer component in Mozilla Firefox b
CVE-2012-3993 CRITICAL POC
9.3 Oct 10

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 16.0, Firefox ESR 10.x before 10.0.8, Thunderbi
CVE-2013-1710 CRITICAL POC
10.0 Aug 07

The crypto.generateCRMFRequest function in Mozilla Firefox before 23.0, Firefox ESR 17.x before 17.0.8, Thunderbird befo
CVE-2017-3823 HIGH POC
8.8 Feb 01

An issue was discovered in the Cisco WebEx Extension before 1.0.7 on Google Chrome, the ActiveTouch General Plugin Conta
CVE-2014-8636 HIGH POC
7.5 Jan 14

The XrayWrapper implementation in Mozilla Firefox before 35.0 and SeaMonkey before 2.32 does not properly interact with

CVE-2013-0757 CRITICAL POC
9.3 Jan 13

The Chrome Object Wrapper (COW) implementation in Mozilla Firefox before 18.0, Firefox ESR 17.x before 17.0.2, Thunderbi
CVE-2014-1510 CRITICAL POC
9.8 Mar 19

The Web IDL implementation in Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and Se
CVE-2014-1511 CRITICAL POC
9.8 Mar 19

Mozilla Firefox before 28.0, Firefox ESR 24.x before 24.4, Thunderbird before 24.4, and SeaMonkey before 2.25 allow remo
CVE-2013-0643 HIGH
8.8 Feb 27

The Firefox sandbox in Adobe Flash Player before 10.3.183.67 and 11.x before 11.6.602.171 on Windows and Mac OS X, and b

Same weakness CWE-843 – Access of Resource Using Incompatible Type (Type Confusion)

View all
CVE-2011-0611 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2017-8291 HIGH POC
7.8
CVE-2016-7201 HIGH POC
8.8
CVE-2017-0037 HIGH POC
8.1
CVE-2019-0752 HIGH POC
7.5
CVE-2017-5070 HIGH POC
8.8
CVE-2025-30397 HIGH POC
7.5

Same technique Memory Corruption

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2010-3333 HIGH POC
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

Share

CVE-2026-16410 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy