Out-of-bounds Read in Libusb
CVE-2026-47104
libusb before version 1.0.30 contains a one-byte out-of-bounds read vulnerability in parse_iad_array() in descriptor.c that allows attackers to trigger a denial of service by supplying a malformed USB descriptor whose bLength equals size minus one, causing the bounds check to use the original buffer size instead of the remaining size. Attackers in virtualized environments with USB passthrough can supply crafted descriptors through libusb_get_active_interface_association_descriptors or libusb_get_interface_association_descriptors to read one byte past the end of the malloc allocation, resulting in a denial of service.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.002 (7.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.001
Affected products
- Libusb — versions 0
Weakness classification (CWE)
References
- github.com/libusb/libusb/releases/tag/v1.0.30 (release-notes, Product, Release Notes)
- github.com/libusb/libusb/issues/1813 (issue-tracking, technical-description, Mitigation, Issue Tracking)
- github.com/libusb/libusb/pull/1814 (issue-tracking, Patch, Issue Tracking)
- github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704 (Patch, patch)
- www.vulncheck.com/advisories/libusb-out-of-bounds-read-in-parse-iad-array (Patch, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-47104?
- CVE-2026-47104 is a medium-severity vulnerability in Libusb, classified under Out-of-bounds Read. CVSS score: 4.0/10. Published 2026-05-27.
- How severe is CVE-2026-47104?
- Medium severity. CVSS v3 base score is 4.0 out of 10.