What’s Vulnerable › Vulnerabilities

CVE-2026-23679: libusb < 1.0.30 NULL Pointer Dereference in parse_interface()

• Severity: medium (CVSS 5.5 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: 2026-05-27 · updated 2026-10-14
• Weakness: CWE-125

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.

Affected products

• libusb: before 1.0.30 — fixed in 1.0.30

How to fix

Upgrade to a fixed version: libusb 1.0.30. Check the vendor advisory for mitigations.

References

• https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704
• https://github.com/libusb/libusb/issues/1813
• https://github.com/libusb/libusb/pull/1814
• https://github.com/libusb/libusb/releases/tag/v1.0.30
• https://www.vulncheck.com/advisories/libusb-null-pointer-dereference-in-parse-interface
• https://github.com/libusb/libusb/issues/1813

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