CVE detail
CVE-2026-6687
FatFs R0.16 and earlier contains a stack overflow bug in f_getlabel() because exFAT label length (XDIR_NumLabel) is trusted without enforcing spec maximums. This maps to CWE-121 (Stack-based Buffer Overflow). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 19.5 · diversity 18.0 · KEV 0.0 · OTX 0.0 · PoC 4.5
Why it matters now
Mention timeline
- Total mentions
- 6
- within the 30d window
- Peak daily
- 4
- highest bucket
Evidence
Source links by recency
6 source links · newest first
- Seven Bugs in FatFs Put IoT and Embedded Devices at RiskSecurity Affairs
runZero found 7 flaws in FatFs, a filesystem used in IoT and embedded devices. Bugs can cause memory corruption, crashes, or data leaks via crafted storage. Cybersecurity firm runZero has disclosed seven vulnerabilities in FatFs, a compact open-source library that lets embedded devices read and write FAT and exFAT formatted storage, the same formats used […]
newssecurityaffairs.comJul 6, 2026, 10:20 AM d, and FatFs mishandles the bad data. runZero rated the set CVSS Medium to High, with no Criticals. The headline bug is CVE-2026-6682 (CVSS 7.6), an integer overflow in the code that mounts a FAT32 volume. Bad math can produce a false file size, which later code treats as a real read length. On real hardware, that can become memory corruption and code
newsthehackernews.comJul 3, 2026, 8:19 PM- https://www.runzero.com/blog/fatfs-bugs/www.runzero.com
No excerpt available.
Exploitwww.runzero.comJul 1, 2026, 3:17 PM No excerpt available.
Exploitwww.runzero.comJul 1, 2026, 3:17 PMNo excerpt available.
Exploitgithub.comJul 1, 2026, 3:17 PM- https://elm-chan.org/fsw/ff/elm-chan.org
No excerpt available.
Productelm-chan.orgJul 1, 2026, 3:17 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
1 repository references · best confidence 0.90 · max 0 stars
- runZeroInc/vulns-2026-fatfs-chanceHigh confidencegithubNVD Exploit reference0 starsDiscovered Jul 20, 2026, 12:20 AM
NVD labels the source link as Exploit; this is not independent verification of the repository's code.
Related records
Similar CVEs
6 related CVEs with shared weakness or product evidence
- CVE-2026-51244CVSS 7.5 · High
schreibfaul1 ESP32-audioI2S 3.4.5 has a buffer overflow vulnerability in UnpackFrameHeader(). Multiple attacker-controlled index parameters are used to access static and heap tabl…
- CVE-2026-12495CVSS 5.3 · Medium
Denial-of-service (DoS) vulnerability due to a stack buffer overflow in the http_gdpr_decrypt function of the Mercusys MB115-4G device's web interface. An unauthenticated attacker…
- CVE-2026-55728CVSS 3.8 · Low
Stack-based Buffer Overflow (CWE-121) in `/usr/bin/ltsudo` `cmd_ipaddr_conflict` in Loytec LIP-ME201C, L-INX, L-GATE, L-ROC, L-IOB, L-DALI, L-VIS and L-PAD through 8.4.16 on LINX…
- CVE-2026-16870CVSS 8.8 · High
Multiple security vulnerabilities in Snowflake libsnowflakeclient versions prior to 2.9.2 could allow remote code execution and credential exfiltration. A stack-based buffer overf…
- CVE-2026-50039CVSS 8.7 · High
The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to cause a memory corruption via a Read Request.
- CVE-2026-64831CVSS 8.7 · High
FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and…