{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.3.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4115aebf9fe29b78caecb7ee8a379390537a0a76"
            },
            {
              "fixed": "26efb5daff0757365101035145331b0a5a85d9d9"
            }
          ],
          "repo": "https://github.com/nilfs-dev/nilfs-utils",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-1284"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55392.json"
  },
  "details": "NILFS utilities through 2.3.0, fixed in commit 26efb5d, nilfs_sb_is_valid() function fails to validate s_log_block_size field in NILFS2 superblock before bit-shift operations. Attackers supplying crafted NILFS2 images trigger undefined behavior through oversized shifts or out-of-memory conditions, crashing tools like nilfs-tune and dumpseg.",
  "id": "CVE-2026-55392",
  "modified": "2026-07-08T05:36:00.408843540Z",
  "published": "2026-06-18T18:00:12.736Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55392.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55392"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nilfs-dev/nilfs-utils/issues/26"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nilfs-dev/nilfs-utils/commit/26efb5daff0757365101035145331b0a5a85d9d9"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nilfs-dev/nilfs-utils"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "NILFS utilities - Undefined Behavior and Out-of-Memory via Unvalidated s_log_block_size"
}