Type Confusion Vulnerability in littlefs by LittleFS Project
CVE-2026-129490

6.8MEDIUM

Key Information:

Vendor

Littlefs-project

Status
Littlefs
Vendor
CVE Published:
15 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-129490?

The littlefs version up to 2.11.3, when built with LFS_MIGRATE, has a type confusion vulnerability in its lfs_dir_traverse function. This vulnerability allows attackers to exploit crafted littlefs v1 images that cause the metadata to be improperly interpreted as LFS_FROM_USERATTRS during migration. Consequently, this can lead to out-of-bounds stack reads and crashes in the process, posing significant risks to system stability and security.

Affected Version(s)

littlefs 0 <= 2.11.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-129490 - Proof of Concept

References

https://github.com/littlefs-project/littlefs/issues/1213
issue-tracking
https://github.com/littlefs-project/littlefs/blob/v2.11.3...
technical-description
https://github.com/sigdevel/pocs/blob/main/res/littlefs/1...
exploit

CVSS V4

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Alexander A. Shvedov (sigdevel)
.