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CVE-2026-4715 is an uninitialized memory vulnerability in Mozilla's Graphics: Canvas2D component affecting Firefox before 149, Firefox ESR before 140.9, Thunderbird before 149, and Thunderbird before 140.9. The issue arises from use of uninitialized memory within Canvas2D processing. Based on the available record and NVD classification, the weakness maps to CWE-908. The provided sources do not identify the exact vulnerable function or code path, but indicate the flaw is reachable in the Canvas2D graphics subsystem and may lead to memory disclosure and potentially instability.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.