Loading vulnerability…
CVE-2026-6682 affects FatFs R0.16 and earlier. During FAT32 volume mounting in mount_volume(), an integer multiplication used in FAT size calculation (described as fasize *= fs->n_fats) can overflow and wrap. A crafted FAT32 filesystem image can therefore cause incorrect internal filesystem metadata, including attacker-controlled file-size values. Downstream code may later trust those corrupted size values as legitimate read lengths, creating unsafe memory operations. In real deployments this can lead to heap or stack corruption, and the published research describes possible code execution as a consequence.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An integer overflow vulnerability in the FatFs filesystem library during FAT32 volume mounting that can lead to memory corruption and potential code execution.
A high-severity FAT32 integer overflow in FatFs mount_volume() that can create attacker-controlled file-size metadata, potentially leading to heap or stack corruption and code execution.
An integer overflow in FatFs during FAT32 volume mounting that can lead to memory corruption and possible arbitrary code execution, including via certain firmware update mechanisms.
An integer overflow in FatFs mount_volume() during FAT32 mounting that can produce attacker-controlled file-size metadata and potentially lead to heap or stack overflow and code execution.
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.