Out-of-bounds Read in Libusb
CVE-2026-23679
libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to crash applications by supplying a malformed USB configuration descriptor where an interface claims bNumEndpoints greater than zero but is followed by a class-specific descriptor whose bLength exceeds the remaining buffer size, causing parse_interface() to return early without allocating the endpoint array. Attackers can exploit this flaw through libusb_get_active_config_descriptor or libusb_get_config_descriptor by providing crafted descriptors via virtualized USB passthrough, file-based descriptor parsing, or network sources, causing any application iterating over endpoints to dereference a NULL endpoint pointer and crash.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
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-null-pointer-dereference-in-parse-interface (Patch, Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-23679?
- CVE-2026-23679 is a medium-severity vulnerability in Libusb, classified under Out-of-bounds Read. CVSS score: 6.2/10. Published 2026-05-27.
- How severe is CVE-2026-23679?
- Medium severity. CVSS v3 base score is 6.2 out of 10.