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Medium

libusb < 1.0.30 NULL Pointer Dereference in parse_interface()

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-23679
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 08:46 UTC · Revision 1

Source evidence

libusb < 1.0.30 NULL Pointer Dereference in parse_interface()

core-osv · Original source

Published 27 May 2026, 13:21 UTC

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.

osv:CVE-2026-23679
Complete source record
{
  "id": "9a3c636212c85686db0aff44caa01c5b4a6a0b34186d736951ace869a308c22d",
  "url": "https://osv.dev/vulnerability/CVE-2026-23679",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "libusb < 1.0.30 NULL Pointer Dereference in parse_interface()",
    "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 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.",
    "evidence": "osv:CVE-2026-23679",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-23679",
      "aliases": [
        "CVE-2026-23679",
        "PYSEC-2026-3978"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/libusb/libusb",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "87a55632db62c9bdc58cd31d3ccfa673f1bb017f"
                },
                {
                  "fixed": "578ab76b4c434f8b204137ab6d7310689c7a9704"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:libusb:libusb:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.0.30"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "578ab76b4c434f8b204137ab6d7310689c7a9704"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "87a55632db62c9bdc58cd31d3ccfa673f1bb017f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v1.0.30"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v1.0.30-rc1",
            "v1.0.29",
            "v1.0.28",
            "v1.0.28-rc1",
            "v1.0.27",
            "v1.0.27-rc2",
            "v1.0.27-rc1",
            "v1.0.26",
            "v1.0.26-rc1",
            "v1.0.25",
            "v1.0.25-rc1",
            "v1.0.24",
            "v1.0.24-rc1",
            "v1.0.23",
            "v1.0.23-rc3",
            "v1.0.23-rc2",
            "v1.0.23-rc1",
            "v1.0.22",
            "v1.0.22-rc4",
            "v1.0.22-rc3",
            "v1.0.22-rc2",
            "v1.0.22-rc1",
            "v1.0.21",
            "v1.0.21-rc6",
            "v1.0.21-rc5",
            "v1.0.21-rc4",
            "v1.0.21-rc3",
            "v1.0.21-rc2",
            "v1.0.21-rc1",
            "v1.0.20",
            "v1.0.20-rc3",
            "v1.0.20-rc2",
            "v1.0.20-rc1",
            "v1.0.19",
            "v1.0.19-rc2",
            "v1.0.19-rc1",
            "v1.0.18",
            "v1.0.18-rc1",
            "v1.0.17",
            "v1.0.17-rc1",
            "v1.0.16",
            "v1.0.16-rc3",
            "v1.0.16-rc2",
            "v1.0.16-rc1",
            "v1.0.15",
            "v1.0.15-rc3",
            "v1.0.15-rc2",
            "v1.0.15-rc1",
            "v1.0.14",
            "v1.0.13",
            "v1.0.13-rc2",
            "v1.0.13-rc1",
            "v1.0.12",
            "v1.0.12-rc1",
            "v1.0.11",
            "v1.0.11-rc1",
            "v1.0.10",
            "v1.0.10-rc1",
            "v1.0.9",
            "v1.0.9-rc5",
            "v1.0.9-rc4",
            "v1.0.8",
            "v1.0.7",
            "v1.0.6",
            "v1.0.5",
            "v1.0.4",
            "v1.0.3",
            "v1.0.2",
            "v1.0.1",
            "v1.0.0",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "academic-demo"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23679.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:47.194006188Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23679.json",
        "https://github.com/libusb/libusb/releases/tag/v1.0.30",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23679",
        "https://www.vulncheck.com/advisories/libusb-null-pointer-dereference-in-parse-interface",
        "https://github.com/libusb/libusb/issues/1813",
        "https://github.com/libusb/libusb/pull/1814",
        "https://github.com/libusb/libusb/commit/578ab76b4c434f8b204137ab6d7310689c7a9704",
        "https://github.com/libusb/libusb"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-125"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23679.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23679",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 515017,
  "published_at": "2026-05-27T13:21:37.035+00:00"
}