CVE-2026-82238 (GCVE-0-2026-82238)
Vulnerability from cvelistv5
Published
2026-08-28 10:49
Modified
2026-08-28 10:49
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Summary
filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared Upload-Length by sending concurrent PATCH requests. Attackers can send multiple simultaneous PATCH requests at the same offset to bypass length validation, resulting in files that exceed their declared size and triggering completion hooks for oversized uploads.
Impacted products
Show details on NVD website


{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "packageURL": "pkg:golang/github.com/filebrowser/filebrowser/v2",
          "product": "filebrowser",
          "vendor": "filebrowser",
          "versions": [
            {
              "lessThan": "2.24.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            }
          ]
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:filebrowser:filebrowser:*:*:*:*:*:*:*:*",
                  "vulnerable": true
                }
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
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          "lang": "en",
          "type": "reporter",
          "value": "skeletonsec"
        }
      ],
      "datePublic": "2026-08-14T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared Upload-Length by sending concurrent PATCH requests. Attackers can send multiple simultaneous PATCH requests at the same offset to bypass length validation, resulting in files that exceed their declared size and triggering completion hooks for oversized uploads."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "privilegesRequired": "LOW",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
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            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-28T10:49:27.289Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-4r8p-gqj2-mwgm)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/filebrowser/filebrowser/security/advisories/GHSA-4r8p-gqj2-mwgm"
        },
        {
          "name": "VulnCheck Advisory: filebrowser 2.24.0 Race Condition via TUS concurrent PATCH uploads",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/filebrowser-2.24.0-race-condition-via-tus-concurrent-patch-uploads"
        }
      ],
      "title": "filebrowser 2.24.0 Race Condition via TUS concurrent PATCH uploads",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-82238",
    "datePublished": "2026-08-28T10:49:27.289Z",
    "dateReserved": "2026-08-28T10:37:04.621Z",
    "dateUpdated": "2026-08-28T10:49:27.289Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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