CVE-2026-129490

littlefs through 2.11.3 Type Confusion in lfs_dir_traverse via lfs_migrate

Published Nov 15, 2026 CVSS 4.0 · 6.8 Medium EPSS n/a KEV · Not listed

Description

littlefs through 2.11.3, when built with LFS_MIGRATE, contains a type confusion vulnerability in lfs_dir_traverse() that treats a stack lfs_diskoff struct as an lfs_attr array. Attackers can supply a crafted littlefs v1 image whose metadata is read as LFS_FROM_USERATTRS during migration, causing out-of-bounds stack reads and process crashes.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

littlefs-project

littlefs

unaffected

Version	Status	Constraints
`0`	affected	≤ 2.11.3

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

References

Link	Providers
https://github.com/littlefs-project/littlefs/blob/v2.11.3/lfs.c#L1056-L1063
https://github.com/littlefs-project/littlefs/issues/1213
https://github.com/sigdevel/pocs/blob/main/res/littlefs/1/1_lfs_dir_traverse_lfs_c_1059.img
https://www.vulncheck.com/advisories/littlefs-through-2.11.3-type-confusion-in-lfs-dir-traverse-via-lfs-migrate

History

Nov 15, 2026 4:00 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		littlefs through 2.11.3, when built with LFS_MIGRATE, contains a type confusion vulnerability in lfs_dir_traverse() that treats a stack lfs_diskoff struct as an lfs_attr array. Attackers can supply a crafted littlefs v1 image whose metadata is read as LFS_FROM_USERATTRS during migration, causing out-of-bounds stack reads and process crashes.
Title		littlefs through 2.11.3 Type Confusion in lfs_dir_traverse via lfs_migrate
Weaknesses		CWE-843
References		https://github.com/littlefs-project/littlefs/blob/v2.11.3/lfs.c#L1056-L1063 https://github.com/littlefs-project/littlefs/issues/1213 https://github.com/sigdevel/pocs/blob/main/res/littlefs/1/1_lfs_dir_traverse_lfs_c_1059.img https://www.vulncheck.com/advisories/littlefs-through-2.11.3-type-confusion-in-lfs-dir-traverse-via-lfs-migrate
Metrics		cvssV3_1 `{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}` cvssV4_0 `{'score': 6.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}`