CVE-2022-26486 is an use-after-free vulnerability in Mozilla Firefox. CISA added it to the Known Exploited Vulnerabilities catalogue on 7 March 2022, which means attackers have used it in real attacks. Mozilla Firefox contains a use-after-free vulnerability in WebGPU IPC Framework which can be exploited to perform arbitrary code execution.
What a use-after-free means in Firefox
A use-after-free happens when software keeps using memory after it has been released. In a browser like Firefox, that is especially serious because the bug sits on the boundary between untrusted web content and code that processes complex browser state.
With CVE-2022-26486, the vulnerable path is in Firefox’s WebGPU IPC framework, so the defect is not just a crash risk. It can become a memory corruption primitive that attackers may turn into arbitrary code execution when the right conditions are met.
Why this class of bug is dangerous in a browser
Browsers are exposed to hostile input by design, which makes memory-safety bugs high value targets. A use-after-free can let an attacker influence freed memory, corrupt internal objects, or steer execution in ways the browser never intended.
That danger is amplified in systems with rich parsers, graphics paths, or cross-process messaging. In practice, a flaw like this can move from a page interaction to code execution if the attacker can reliably shape heap behaviour and reach the vulnerable component. For background on how memory-safety weaknesses are categorized, see the CWE Top 25 Guide.
How organisations assess exposure
The first question is whether Firefox is present anywhere in the environment, including developer workstations, shared systems, managed desktops, and remote endpoints. From there, teams should confirm whether the affected build is still installed and whether the browser is internet-facing through normal user activity, because browser exploitation usually starts with ordinary web access.
For version and remediation details, the authoritative references are the vendor advisory and the NIST National Vulnerability Database. If you are triaging the issue operationally, the Vulnerability Management Guide is useful for prioritisation, verification, and exception handling around known exploited vulnerabilities.
Remediation, detection, and post-exploitation review
The safest response is to move to the vendor-fixed release as quickly as possible and then verify that the vulnerable binary is no longer present on managed assets. If patching is delayed, reduce exposure by limiting unnecessary browser use on high-trust systems, tightening endpoint controls, and treating suspicious browser crashes or unusual child-process activity as potential compromise indicators.
Because CISA placed this CVE in the KEV catalogue, organisations should assume it has been attractive to real attackers and review for post-exploitation signs if exposure existed before patching. The browser may be the entry point, but the identity impact can extend beyond the application itself if an attacker used the session to steal cookies, tokens, saved credentials, or other authenticated browser state. The CVE Program remains the best reference for the canonical identifier and record structure.
Risk and Threat Considerations
Browser use-after-free bugs matter because they can convert a routine web visit into code execution on an endpoint that often has access to email, cloud apps, internal portals, and saved sessions. Once a browser process is compromised, attackers may pivot into the user’s active web identity and harvest material that survives beyond the initial exploit.
Failure mechanism: The attacker triggers the memory bug, gains corruption of freed objects, and uses that corruption to steer execution or destabilise the browser in a way that enables further exploitation.
Impact: The result can be arbitrary code execution, session theft, credential exposure, and follow-on compromise of any services reachable from the affected browser context.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST CSF 2.0, NIST SP 800-53 Rev 5, CIS Controls v8 and OWASP ASVS set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST CSF 2.0 | DE.CM-01 — Security Continuous Monitoring | Browser exploitation requires monitoring for crash and compromise signals. |
| Recommendation — Monitor endpoints for abnormal browser crashes and post-exploit indicators. | ||
| NIST SP 800-53 Rev 5 | SI-2 — Flaw Remediation | This CVE requires timely remediation of a known exploited software flaw. |
| SI-4 — System Monitoring | Exploit activity is often detected through endpoint and process anomalies. | |
| Recommendation — Patch Firefox quickly and verify the vulnerable build is removed. Review browser and endpoint telemetry for exploitation indicators. | ||
| CIS Controls v8 | CIS-7 — Continuous Vulnerability Management | Known exploited browser vulnerabilities belong in vulnerability prioritisation and remediation. |
| Recommendation — Prioritise this KEV-listed browser flaw in your remediation queue. | ||
| OWASP ASVS | V15 — Secure Coding and Architecture | Use-after-free is a memory-safety weakness addressed by secure design and implementation practices. |
| Recommendation — Harden browser-facing code paths against memory corruption weaknesses. | ||
Practitioner Guidance
Why practitioners should care: Treat this class of browser vulnerability as an endpoint security issue, not just an application bug. If the browser is widely deployed, the blast radius can be large because the same weakness may exist across many users and many high-value sessions.
What to watch for: Look for repeated browser crashes, abnormal GPU or rendering activity, unexplained child processes, and signs that user sessions or browser-stored secrets were accessed after a suspicious visit. A clean patch does not automatically rule out compromise if exploitation occurred before remediation.
Practitioner takeaway: Prioritise fast patching, then validate whether the endpoint or the user’s authenticated browser state needs follow-up review, especially on systems used for privileged or high-sensitivity work.
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