CVE-2026-92078 Mozilla CVE debrief

Who should care

Defenders responsible for managing Firefox, Firefox ESR, and Thunderbird installations should assess exposure and apply patches to prevent potential denial-of-service attacks. This includes operators, security teams, and vulnerability management teams. Defenders should prioritize verifying exposure and applying patches for Firefox, Firefox ESR, and Thunderbird, especially in environments where these applications are widely used.

Why it matters

Defenders should prioritize verifying exposure and applying patches for Firefox, Firefox ESR, and Thunderbird to prevent potential denial-of-service attacks. The vulnerability's impact is limited to denial-of-service attacks, and no evidence of exploitation or data theft exists. Additional information on potential exploitation or impact is limited, and defenders should rely on official sources for updates.

• Potential denial-of-service attacks against unpatched Firefox, Firefox ESR, and Thunderbird installations
• Need to verify exposure and apply patches to prevent potential attacks
• Possible impact on service availability if exploited

Technical summary

The vulnerability exists in the Security component of Firefox, Firefox ESR, and Thunderbird. A denial-of-service attack can be triggered by exploiting this vulnerability. The issue was addressed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. This issue is limited to denial-of-service attacks with no evidence of exploitation or data theft. Defenders should prioritize verifying exposure and applying patches for Firefox, Firefox ESR, and Thunderbird, especially in environments where these applications are widely used.

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Firefox, Firefox ESR, and Thunderbird, especially in environments where these applications are widely used.

Recommended defensive actions

• Verify and apply patches for Firefox, Firefox ESR, and Thunderbird
• Inventory checks for affected versions and update to patched versions
• Monitor for potential denial-of-service attacks
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information on potential exploitation or impact is limited. Defenders should verify exposure and apply patches to prevent potential denial-of-service attacks. The vulnerability's impact is limited to denial-of-service attacks, and no evidence of exploitation or data theft exists.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.