CVE-2022-4262 is a type confusion vulnerability in Google Chromium V8. CISA added it to the Known Exploited Vulnerabilities catalogue on 5 December 2022, which means attackers have used it in real attacks. Google Chromium V8 Engine contains a type confusion vulnerability that allows a remote attacker to potentially exploit heap corruption via a crafted HTML page.
Why CVE-2022-4262 Matters
CVE-2022-4262 is a browser engine type confusion flaw, which matters because type confusion can let crafted content drive memory corruption in a highly exposed execution environment. In a browser engine, that kind of bug can turn a single malicious page into a reliable foothold for code execution, sandbox escape attempts, or follow-on exploitation.
Because the vulnerability was added to CISA’s Known Exploited Vulnerabilities catalogue, it should be treated as an actively abused weakness, not just a theoretical browser bug. That elevates the urgency of exposure review, patch prioritisation, and post-exploitation investigation.
How Type Confusion Becomes a Security Problem
Type confusion occurs when software treats an object as one type while it is actually another. In a memory-unsafe engine, that mismatch can corrupt heap structures, redirect program flow, or expose adjacent data. For browser engines, the danger is amplified by the enormous attack surface created by ordinary web content and the speed with which malicious pages can be distributed.
Attackers value browser-engine flaws because they can be delivered remotely and trigger during normal browsing. A successful exploit may provide code execution within the browser process or a powerful stepping stone for chained attacks. For broader context on exploited vulnerabilities and why KEV-listed issues deserve immediate attention, see NIST National Vulnerability Database and the CVE Program.
Checking Exposure and Reducing Immediate Risk
Exposure starts with knowing where Chromium-based browsers or embedded V8 components are in use, including managed desktops, virtual workspaces, kiosks, developer environments, and applications that bundle browser rendering or JavaScript execution. Organisations should also check whether internet-facing users, high-risk roles, or privileged workstations are more likely to encounter hostile content.
If patching is delayed, organisations should reduce risk by restricting exposure to untrusted web content, tightening browser isolation and policy controls, and prioritising updates on assets most likely to encounter active exploitation. The practical workflow is the same one used for other KEV-driven weaknesses: confirm asset scope, validate vendor guidance, and remediate the most exposed systems first. Vulnerability Management Guide covers this prioritisation model in more depth.
Detection, Verification, and Identity Impact After Exploitation
For browser-engine exploitation, detection often depends on correlating browser crashes, unusual process behaviour, exploit-delivery indicators, and any suspicious child processes spawned after browsing a crafted page. After patching, organisations should still review for signs that the vulnerability was exploited before remediation, because browser bugs are frequently used to establish an initial foothold before later stages are visible.
Where compromise is suspected, the identity impact can extend beyond the endpoint itself. Attackers may steal browser sessions, saved credentials, tokens, cookies, or secrets accessible from the affected user context. That makes post-patch review and selective credential rotation important when there is evidence of successful exploitation. The broader pattern of credential theft and downstream misuse is explored in The State of NHI & AI Agent Breach Report 2026.
Risk and Threat Considerations
CVE-2022-4262 is dangerous because browser-engine memory corruption can be triggered remotely through content that users are expected to render and trust. That combination of low-friction delivery and high browser privilege makes type confusion a common route to real-world exploitation.
Failure mechanism: A crafted page drives the engine into treating memory as the wrong type, corrupting heap state and potentially enabling code execution or further compromise.
Impact: Successful exploitation can expose the browser session, user secrets, and endpoint trust boundary, and may become the first stage of a broader intrusion.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack and risk surface, while CIS Controls v8, NIST SP 800-53 Rev 5 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | CVE-2022-4262 is an exploited vulnerability requiring prioritized remediation. |
| Recommendation — Prioritize and remediate KEV-listed browser vulnerabilities quickly. | ||
| NIST SP 800-53 Rev 5 | RA-5 — Vulnerability Monitoring and Scanning | The term centers on identifying exposure to a known exploited vulnerability. |
| SI-2 — Flaw Remediation | This browser engine flaw requires timely patching and verification after exploitation. | |
| Recommendation — Scan exposed assets and track vulnerable browser components continuously. Apply vendor remediation promptly and verify affected systems are updated. | ||
| MITRE ATT&CK | T1203 — Exploitation for Client Execution | The vulnerability enables remote exploitation through crafted web content in a client process. |
| Recommendation — Map exploit telemetry to client-execution activity and investigate suspicious browser behavior. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Type confusion is a memory-safety and architecture failure in executable browser code. |
| Recommendation — Review browser-embedded code paths for type safety and memory-safety defects. | ||
Practitioner Guidance
Why practitioners should care: KEV-listed browser flaws should move to the front of remediation queues because they are already being exploited in the wild, and browsers are among the most common entry points for remote compromise. Treat affected endpoints as high-priority assets until patching and verification are complete.
What to watch for: Pay attention to crash telemetry, abnormal browser child processes, suspicious downloads, and any unexplained session use after exposure to untrusted content. If exploitation is confirmed or strongly suspected, review associated accounts, tokens, and saved credentials for rotation.
Related resources from NHI Mgmt Group
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Reviewed and updated by the NHIMG editorial team on October 17, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org