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CVE-2025-13016 is a memory-safety vulnerability in the JavaScript WebAssembly component used by Mozilla Firefox and Mozilla Thunderbird. The flaw is described as incorrect boundary conditions in WebAssembly-related code that can result in a stack buffer overflow, reportedly within garbage-collection-related memory handling and template-heavy code paths. Under crafted conditions, out-of-bounds writes can occur beyond the intended stack buffer, creating a path to arbitrary code execution in the context of the affected application process. Mozilla fixed the issue in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.
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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.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity stack buffer overflow vulnerability in the WebAssembly engine's JavaScript component of Mozilla Firefox and Thunderbird, allowing potential arbitrary code execution.
High-severity stack buffer overflow in Mozilla Firefox/Thunderbird WebAssembly engine (JavaScript component) caused by faulty pointer arithmetic/boundary conditions, enabling remote arbitrary code execution via malicious webpages or crafted Thunderbird content.
A critical remote code execution vulnerability in Mozilla Firefox caused by a stack buffer overflow in the WebAssembly engine’s Garbage Collection memory feature, allowing arbitrary code execution on affected user devices.
A critical Firefox WebAssembly (Wasm) memory flaw affecting a large user base.
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.