{"id":"CVE-2026-23679","aliases":["PYSEC-2026-3978"],"title":"libusb before version 1.0.30 contains a NULL pointer dereference vulnerability that allows attackers to crash applications by supplying a…","summary":"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 bu…","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","vendor":"libusb","product":"libusb","ecosystem":"pip","affected":["libusb < 1.0.30"],"patched":["libusb 1.0.30"],"published":"2026-05-27","updated":"2026-09-11","sourceUpdated":"2026-09-11T12:00:03.923366646Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/PYSEC-2026-3978","references":[{"url":"https://github.com/libusb/libusb/releases/tag/v1.0.30"},{"url":"https://github.com/libusb/libusb/issues/1813"},{"url":"https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704"},{"url":"https://github.com/libusb/libusb/pull/1814"},{"url":"https://www.vulncheck.com/advisories/libusb-null-pointer-dereference-in-parse-interface"}],"tags":["osv","pip"],"epss":0.00184,"epssPercentile":0.08253,"ingestedAt":"2026-09-12T03:13:01.743Z","slug":"CVE-2026-23679","body":"## Overview\n\nlibusb 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.\n\n## Affected packages\n\n- `libusb < 1.0.30`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `libusb 1.0.30`","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}