Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck
CVE-2026-111135libfwsi through 20260522 Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data
Medium 6.1
In plain English
A medium-severity out-of-bounds read in libfwsi from libyal. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities).
Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 90.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
libfwsi through 20260522 contains a heap out-of-bounds read vulnerability in libfwsi_mtp_volume_values_read_data() that allows attackers to read past buffer bounds via crafted MTP volume shell items. Attackers can embed a 10 to 53 byte shell item with item data size of 44 or more in a .lnk file, jump list or shell bag to crash consuming processes.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libfwsi | no fix listed | DEBIAN-CVE-2026-111135 |
| Debian:13 | libfwsi | no fix listed | DEBIAN-CVE-2026-111135 |
| Debian:14 | libfwsi | no fix listed | DEBIAN-CVE-2026-111135 |
| Ubuntu:22.04:LTS | libfwsi | no fix listed | UBUNTU-CVE-2026-111135 |
| Ubuntu:24.04:LTS | libfwsi | no fix listed | UBUNTU-CVE-2026-111135 |
| Ubuntu:26.04:LTS | libfwsi | no fix listed | UBUNTU-CVE-2026-111135 |
| Ubuntu:26.10 | libfwsi | no fix listed | UBUNTU-CVE-2026-111135 |
Affected products (as reported)
Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
References
- https://hackmd.io/@haind-pwn/libfwsi-mtp-values-oob-read technical-description
- https://github.com/libyal/libfwsi/blob/2f2aba25b888f37314a39d8c3e71c0e3ced56e59/libfwsi/libfwsi_mtp_volume_values.c#L248-L273 technical-description
- https://github.com/libyal/libfwsi product
- VulnCheck Advisory: libfwsi through 20260522 Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data third-party-advisory
- https://hackmd.io/@haind-pwn/cve-2026-111134-111135-libfwsi-mtp-values-oob-read exploit