CVE-2026-47104: libusb Out-of-bounds Read — Fix

Description

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.

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CVSS v3.1 Score

4.0

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0013

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
libusb	libusb	< 1.0.30

References

Advisories & Patches

https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704 https://github.com/libusb/libusb/pull/1814 https://www.vulncheck.com/advisories/libusb-out-of-bounds-read-in-parse-iad-array

Other References

https://github.com/libusb/libusb/issues/1813 https://github.com/libusb/libusb/releases/tag/v1.0.30

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.0 (MEDIUM).

How severe is CVE-2026-47104? +

CVE-2026-47104 has a CVSS v3.1 score of 4.0 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0013, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-47104? +

CVE-2026-47104 affects products from libusb, specifically: libusb. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-47104? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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