Loading vulnerability…
CVE-2026-6687 is a stack-based buffer overflow in FatFs R0.16 and earlier affecting exFAT volume label handling in f_getlabel(). The flaw occurs because the implementation trusts the exFAT label length field (XDIR_NumLabel) without enforcing the specification's maximum label length, allowing oversized label data to be written into a small or caller-provided label buffer. The issue is triggered when FatFs parses a crafted exFAT filesystem image containing an overlong volume-label entry. This results in memory corruption on the stack and provides a clean corruption primitive in embedded environments that commonly consume untrusted removable media or mounted update images.
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.
10 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A FatFs buffer overflow triggered by a malformed exFAT volume-label field, enabling memory corruption.
A stack overflow in FatFs f_getlabel() caused by insufficient bounds checking on the exFAT label length field, enabling oversized writes into caller-provided buffers.
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.