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CVE-2026-7321 is a sandbox escape vulnerability in the WebRTC Networking component of Mozilla Firefox and Thunderbird. The flaw is described as incorrect boundary conditions and is associated with a buffer overflow condition caused by insufficient validation of input size before copying data into a fixed-size buffer. This memory corruption condition can be triggered remotely through attacker-controlled WebRTC-related content and may allow execution to break out of the browser sandbox boundary. Mozilla indicates the issue was fixed in Firefox 150, Thunderbird 150, Firefox ESR 140.10.1, and Thunderbird 140.10.1.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A sandbox escape vulnerability in Mozilla Firefox's WebRTC Networking component caused by incorrect boundary conditions.
A buffer overflow vulnerability in Firefox ESR's WebRTC Networking component that can allow remote code execution and browser sandbox escape via malicious webpage or WebRTC content.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.