CVE-2026-111135: libfwsi through 20260522 Heap Out-of-Bounds Read via libfwsi_mtp_volume_values_read_data

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-15 · updated 2026-10-27
Weakness: CWE-125

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 products

libyal libfwsi: through 20260522

References

https://github.com/libyal/libfwsi
https://github.com/libyal/libfwsi/blob/2f2aba25b888f37314a39d8c3e71c0e3ced56e59/libfwsi/libfwsi_mtp_volume_values.c#L248-L273
https://hackmd.io/@haind-pwn/libfwsi-mtp-values-oob-read
https://www.vulncheck.com/advisories/libfwsi-through-20260522-heap-out-of-bounds-read-via-libfwsi-mtp-volume-values-read-data
https://hackmd.io/@haind-pwn/cve-2026-111134-111135-libfwsi-mtp-values-oob-read

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