CVE-2026-109775 Mozilla CVE debrief

Who should care

Defenders responsible for WebRTC deployments and Mozilla Firefox updates should assess exposure and apply necessary patches. The vulnerability affects WebRTC deployments and requires immediate attention from defenders responsible for these systems. Defenders should prioritize verifying exposure in WebRTC deployments and applying Firefox updates to prevent potential denial-of-service attacks.

Why it matters

Defenders should prioritize verifying exposure in WebRTC deployments and applying Firefox updates to prevent potential denial-of-service attacks.

• Potential denial-of-service attacks against WebRTC deployments
• Exposure in WebRTC components requiring verification and patching

Technical summary

The CVE record and Mozilla advisories indicate a denial-of-service vulnerability in the WebRTC component of Mozilla Firefox, which was fixed in Firefox 158 and Firefox ESR 153.5. The vulnerability affects WebRTC deployments and requires immediate attention from defenders responsible for these systems. Defenders should prioritize verifying exposure in WebRTC deployments and applying Firefox updates to prevent potential denial-of-service attacks. The vulnerability has a high severity rating and requires prompt action to prevent exploitation.

Defensive priority

Defenders should prioritize verifying exposure in WebRTC deployments and applying Firefox updates.

Recommended defensive actions

• Verify exposure in WebRTC deployments
• Apply Firefox updates to version 158 or Firefox ESR 153.5
• Monitor WebRTC 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 Mozilla advisories provide limited information about the vulnerability and its impact. The vulnerability affects WebRTC deployments and requires immediate attention from defenders responsible for these systems. Defenders should prioritize verifying exposure in WebRTC deployments and applying Firefox updates to prevent potential denial-of-service attacks. The CVE record was published on 2026-10-13T12:29:34.538Z and has not been modified since then. The vulnerability has a high severity rating and requires prompt to

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.