Vulnerability-Lookup

CVE-2026-86071 (GCVE-0-2026-86071)

Vulnerability from cvelistv5 – Published: 2026-09-16 19:05 – Updated: 2026-09-17 19:25

Title

Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root

Summary

Junrar is an open source Java RAR archive library. Prior to version 7.6.1, LocalFolderExtractor in src/main/java/com/github/junrar/LocalFolderExtractor.java can create directories outside the intended extraction root when processing a crafted archive entry. LocalFolderExtractor.createFile() validates only the final canonical file path, while LocalFolderExtractor.makeFile() creates intermediate path segments with unchecked mkdir() calls. An entry can therefore make the final path resolve inside the destination while causing intermediate directory creation outside it, enabling filesystem pollution or file-versus-directory squatting that can make later security-sensitive writes fail. The demonstrated impact is directory creation, not unconditional arbitrary file-content write. This issue is fixed in version 7.6.1.

Severity

3.7 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 17:10 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/junrar/junrar/security/advisor…	x_refsource_CONFIRM
https://github.com/junrar/junrar/commit/e6e333b19…	x_refsource_MISC
https://github.com/junrar/junrar/releases/tag/v7.6.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
junrar	junrar	Affected: < 7.6.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-86071

Vulnerability from fkie_nvd - Published: 2026-09-16 19:17 - Updated: 2026-09-24 21:25

Severity

3.7 (Low) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/junrar/junrar/commit/e6e333b195a1e3ad271a18fd79d8ac1eb5289343
	security-advisories@github.com	https://github.com/junrar/junrar/releases/tag/v7.6.1
	security-advisories@github.com	https://github.com/junrar/junrar/security/advisories/GHSA-89m4-43j5-vhhx

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "junrar",
          "vendor": "junrar",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 7.6.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Junrar is an open source Java RAR archive library. Prior to version 7.6.1, LocalFolderExtractor in src/main/java/com/github/junrar/LocalFolderExtractor.java can create directories outside the intended extraction root when processing a crafted archive entry. LocalFolderExtractor.createFile() validates only the final canonical file path, while LocalFolderExtractor.makeFile() creates intermediate path segments with unchecked mkdir() calls. An entry can therefore make the final path resolve inside the destination while causing intermediate directory creation outside it, enabling filesystem pollution or file-versus-directory squatting that can make later security-sensitive writes fail. The demonstrated impact is directory creation, not unconditional arbitrary file-content write. This issue is fixed in version 7.6.1."
    }
  ],
  "id": "CVE-2026-86071",
  "lastModified": "2026-09-24T21:25:27.050",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 3.7,
          "baseSeverity": "LOW",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "type": "Secondary"
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GHSA-89M4-43J5-VHHX

Vulnerability from github – Published: 2026-09-17 16:30 – Updated: 2026-09-17 16:30

Summary

Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root

Details

Summary

LocalFolderExtractor validates only the final canonical file path before extraction. However, makeFile() creates intermediate directories one path segment at a time without checking whether each created directory remains inside the destination folder.

A malicious RAR entry can make the final file path resolve inside the extraction destination, while causing intermediate mkdir() calls to create attacker-chosen directories outside the extraction root.

This is an extraction root escape via unchecked intermediate directory creation. The default impact is directory creation outside the intended destination, not unconditional arbitrary file content write.

Affected Code

src/main/java/com/github/junrar/LocalFolderExtractor.java
createFile() checks only the final canonical path.
makeFile() calls dir.mkdir() for each intermediate segment without containment checks.

Relevant code flow:

private File createFile(final FileHeader fh, final File destination) throws IOException {
    String name = invariantSeparatorsPathString(fh.getFileName());
    File f = new File(destination, name);
    String dirCanonPath = f.getCanonicalPath();
    if (!dirCanonPath.startsWith(destination.getCanonicalPath() + File.separator)) {
        throw new IllegalStateException(...);
    }
    if (!f.exists()) {
        f = makeFile(destination, name);
    }
    return f;
}

private File makeFile(final File destination, final String name) throws IOException {
    final String[] dirs = name.split("/");
    String path = "";
    for (int i = 0; i < dirs.length - 1; i++) {
        path = path + File.separator + dirs[i];
        File dir = new File(destination, path);
        dir.mkdir();
    }
    path = path + File.separator + dirs[dirs.length - 1];
    final File f = new File(destination, path);
    f.createNewFile();
    return f;
}

Impact

An attacker who can supply a malicious RAR archive can create directories outside the intended extraction directory.

This violates the expected extraction boundary and can be used for filesystem pollution or file-vs-directory squatting. For example, an attacker can create a directory at a path where a later security-sensitive file is expected, causing future writes to that path to fail.

Severity

3.7 (Low)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.6.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "com.github.junrar:junrar"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.6.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-86071"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-17T16:30:46Z",
    "nvd_published_at": "2026-09-16T19:17:58Z",
    "severity": "LOW"
  },
  "details": "## Summary\n\n`LocalFolderExtractor` validates only the final canonical file path before extraction. However, `makeFile()` creates intermediate directories one path segment at a time without checking whether each created directory remains inside the destination folder.\n\nA malicious RAR entry can make the final file path resolve inside the extraction destination, while causing intermediate `mkdir()` calls to create attacker-chosen directories outside the extraction root.\n\nThis is an extraction root escape via unchecked intermediate directory creation. The default impact is directory creation outside the intended destination, not unconditional arbitrary file content write.\n\n## Affected Code\n\n- `src/main/java/com/github/junrar/LocalFolderExtractor.java`\n  - `createFile()` checks only the final canonical path.\n  - `makeFile()` calls `dir.mkdir()` for each intermediate segment without containment checks.\n\nRelevant code flow:\n\n```java\nprivate File createFile(final FileHeader fh, final File destination) throws IOException {\n    String name = invariantSeparatorsPathString(fh.getFileName());\n    File f = new File(destination, name);\n    String dirCanonPath = f.getCanonicalPath();\n    if (!dirCanonPath.startsWith(destination.getCanonicalPath() + File.separator)) {\n        throw new IllegalStateException(...);\n    }\n    if (!f.exists()) {\n        f = makeFile(destination, name);\n    }\n    return f;\n}\n\nprivate File makeFile(final File destination, final String name) throws IOException {\n    final String[] dirs = name.split(\"/\");\n    String path = \"\";\n    for (int i = 0; i \u003c dirs.length - 1; i++) {\n        path = path + File.separator + dirs[i];\n        File dir = new File(destination, path);\n        dir.mkdir();\n    }\n    path = path + File.separator + dirs[dirs.length - 1];\n    final File f = new File(destination, path);\n    f.createNewFile();\n    return f;\n}\n```\n\n## Impact\n\nAn attacker who can supply a malicious RAR archive can create directories outside the intended extraction directory.\n\nThis violates the expected extraction boundary and can be used for filesystem pollution or file-vs-directory squatting. For example, an attacker can create a directory at a path where a later security-sensitive file is expected, causing future writes to that path to fail.",
  "id": "GHSA-89m4-43j5-vhhx",
  "modified": "2026-09-17T16:30:46Z",
  "published": "2026-09-17T16:30:46Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/junrar/junrar/security/advisories/GHSA-89m4-43j5-vhhx"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86071"
    },
    {
      "type": "WEB",
      "url": "https://github.com/junrar/junrar/commit/e6e333b195a1e3ad271a18fd79d8ac1eb5289343"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/junrar/junrar"
    },
    {
      "type": "WEB",
      "url": "https://github.com/junrar/junrar/releases/tag/v7.6.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Junrar: LocalFolderExtractor mkdir escape allows directory creation outside extraction root"
}

Sightings

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Action not permitted

CVE-2026-86071 (GCVE-0-2026-86071)

FKIE_CVE-2026-86071

GHSA-89M4-43J5-VHHX

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