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…
Does this matter?
Lower severity and a low EPSS score (0.18%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 4.0
- 6.9 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.18% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- libusb/libusb
- Source
- disclosure@vulncheck.com
References
- https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704Patch
- https://github.com/libusb/libusb/issues/1813Issue Tracking, Mitigation
- https://github.com/libusb/libusb/pull/1814Issue Tracking, Patch
- https://github.com/libusb/libusb/releases/tag/v1.0.30Product, Release Notes
- https://www.vulncheck.com/advisories/libusb-null-pointer-dereference-in-parse-interfacePatch, Third Party Advisory
- https://github.com/libusb/libusb/issues/1813Issue Tracking, Mitigation
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.