{"id":"CVE-2021-32769","aliases":["EUVD-2021-1459","GHSA-cjx7-399x-p2rj"],"status":"published","title":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in micronaut-core","description":"Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using \"/../../\" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.01732,"percentile":0.77787,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-22"],"published":"2021-07-16T18:25:09Z","modified":"2026-10-20T14:50:12Z","fixes":[{"ecosystem":"Maven","package":"io.micronaut:micronaut-http-server-netty","fixed_in":["2.5.9"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"io.micronaut:micronaut-http-server-netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.9"}]}]},{"source":"osv","ecosystem":"Maven","package":"io.micronaut:micronaut-http-server-netty","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.9"}]}],"versions":["1.0.0","1.0.0.RC3","1.0.1","1.0.2","1.0.3","1.0.4","1.0.5","1.1.0","1.1.0.M1","1.1.0.M2","1.1.0.RC1","1.1.0.RC2","1.1.1","1.1.2","1.1.3","1.1.4","1.2.0","1.2.0.RC1","1.2.0.RC2","1.2.1","1.2.10","1.2.11","1.2.2","1.2.3","1.2.4","1.2.5","1.2.6","1.2.7","1.2.8","1.2.9","1.3.0","1.3.0.M1","1.3.0.M2","1.3.0.RC1","1.3.1","1.3.2","1.3.3","1.3.4","1.3.5","1.3.6","1.3.7","2.0.0","2.0.0.M1","2.0.0.M2","2.0.0.M3","2.0.0.RC1","2.0.0.RC2","2.0.1","2.0.2","2.0.3","2.1.0","2.1.1","2.1.2","2.1.3","2.1.4","2.2.0","2.2.1","2.2.2","2.2.3","2.3.0","2.3.1","2.3.2","2.3.3","2.3.4","2.4.0","2.4.1","2.4.2","2.4.3","2.4.4","2.5.0","2.5.1","2.5.2","2.5.3","2.5.4","2.5.5","2.5.6","2.5.7","2.5.8"]}],"products":[{"vendor":"micronaut-projects","product":"micronaut-core"},{"vendor":"objectcomputing","product":"micronaut"}],"references":[{"url":"https://github.com/micronaut-projects/micronaut-core/security/advisories/GHSA-cjx7-399x-p2rj","tags":["x_refsource_CONFIRM","x_transferred","Exploit","Patch","Third Party Advisory","fix","web"]},{"url":"https://github.com/micronaut-projects/micronaut-core/commit/a0cfeb13bf1ef5d692d16d4a3b91b34b7456bb11","tags":["x_refsource_MISC","x_transferred","Patch","Third Party Advisory","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32769","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-cjx7-399x-p2rj"}],"sources":{"cve":[{"id":"CVE-2021-32769","title":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in micronaut-core","description":"Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using \"/../../\" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.","status":"published","published":"2021-07-16T18:25:09Z","modified":"2024-08-03T23:33:55.862Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:33:07.014772Z"}],"euvd":[{"id":"EUVD-2021-1459","description":"Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using \"/../../\" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.","status":"published","published":"2021-07-16T18:25:09Z","modified":"2024-08-03T23:33:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-03T03:24:35.855495Z"}],"ghsa":[{"id":"GHSA-cjx7-399x-p2rj","title":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in micronaut-core","description":"With a basic configuration like\n\n```yaml\nrouter:\n  static-resources:\n    assets:\n      enabled: true\n      mapping: /.assets/public/**\n      paths: file:/home/lstrmiska/test/\n```\n\nit is possible to access any file from a filesystem, using \"/../../\" in URL, as Micronaut does not restrict file access to configured paths. \n\n**Repro Steps**\n- create a file test.txt in /home/lstrmiska\n- start micronaut\n- execute command\n`curl -v --path-as-is \"http://localhost:8080/.assets/public/../test.txt\"`\n\n\n### Impact\n\nMicronaut can potentially leak sensitive information.\n\nSee https://cwe.mitre.org/data/definitions/22.html\n\n### Patches\n\n```\ndiff --git a/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java b/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\nindex 2f5a91403..19d3b7f05 100644\n--- a/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\n+++ b/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\n@@ -69,6 +69,9 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     @Override\n     public Optional\u003cInputStream\u003e getResourceAsStream(String path) {\n         Path filePath = getFilePath(normalize(path));\n+        if (pathOutsideBase(filePath)) {\n+            return Optional.empty();\n+        }\n         try {\n             return Optional.of(Files.newInputStream(filePath));\n         } catch (IOException e) {\n@@ -79,7 +82,7 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     @Override\n     public Optional\u003cURL\u003e getResource(String path) {\n         Path filePath = getFilePath(normalize(path));\n-        if (Files.exists(filePath) \u0026\u0026 Files.isReadable(filePath) \u0026\u0026 !Files.isDirectory(filePath)) {\n+        if (!pathOutsideBase(filePath) \u0026\u0026 Files.exists(filePath) \u0026\u0026 Files.isReadable(filePath) \u0026\u0026 !Files.isDirectory(filePath)) {\n             try {\n                 URL url = filePath.toUri().toURL();\n                 return Optional.of(url);\n@@ -117,4 +120,15 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     private Path getFilePath(String path) {\n         return baseDirPath.map(dir -\u003e dir.resolve(path)).orElseGet(() -\u003e Paths.get(path));\n     }\n+\n+    private boolean pathOutsideBase(Path path) {\n+        if (baseDirPath.isPresent()) {\n+            Path baseDir = baseDirPath.get();\n+            if (path.isAbsolute() == baseDir.isAbsolute()) {\n+                Path relativePath = baseDir.relativize(path);\n+                return relativePath.startsWith(\"..\");\n+            }\n+        }\n+        return false;\n+    }\n }\n-- \n\n```\n\n### Workarounds\n\n- do not use ** in mapping, use only * which exposes only flat structure of a directory not allowing traversal\n- run micronaut in chroot (linux only)\n\n### References\n\nSee https://cwe.mitre.org/data/definitions/22.html\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [Github](https://github.com/micronaut-projects/micronaut-core/issues)\n* Email us at [info@micronaut.io](mailto:info@micronaut.io)\n","status":"published","published":"2021-07-26T21:15:08Z","modified":"2023-02-01T05:05:50Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:36:35.781528Z"}],"nvd":[{"id":"CVE-2021-32769","description":"Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using \"/../../\" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.","status":"published","published":"2021-07-16T19:15:07.893Z","modified":"2026-06-17T03:53:35.56Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T14:06:55.747384Z"}],"osv":[{"id":"CVE-2021-32769","description":"Micronaut is a JVM-based, full stack Java framework designed for building JVM applications. A path traversal vulnerability exists in versions prior to 2.5.9. With a basic configuration, it is possible to access any file from a filesystem, using \"/../../\" in the URL. This occurs because Micronaut does not restrict file access to configured paths. The vulnerability is patched in version 2.5.9. As a workaround, do not use `**` in mapping, use only `*`, which exposes only flat structure of a directory not allowing traversal. If using Linux, another workaround is to run micronaut in chroot.","status":"published","published":"2021-07-16T19:15:07.893Z","modified":"2026-10-20T14:50:12.712292983Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:44:19.793849Z"},{"id":"GHSA-cjx7-399x-p2rj","title":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') in micronaut-core","description":"With a basic configuration like\n\n```yaml\nrouter:\n  static-resources:\n    assets:\n      enabled: true\n      mapping: /.assets/public/**\n      paths: file:/home/lstrmiska/test/\n```\n\nit is possible to access any file from a filesystem, using \"/../../\" in URL, as Micronaut does not restrict file access to configured paths. \n\n**Repro Steps**\n- create a file test.txt in /home/lstrmiska\n- start micronaut\n- execute command\n`curl -v --path-as-is \"http://localhost:8080/.assets/public/../test.txt\"`\n\n\n### Impact\n\nMicronaut can potentially leak sensitive information.\n\nSee https://cwe.mitre.org/data/definitions/22.html\n\n### Patches\n\n```\ndiff --git a/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java b/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\nindex 2f5a91403..19d3b7f05 100644\n--- a/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\n+++ b/core/src/main/java/io/micronaut/core/io/file/DefaultFileSystemResourceLoader.java\n@@ -69,6 +69,9 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     @Override\n     public Optional\u003cInputStream\u003e getResourceAsStream(String path) {\n         Path filePath = getFilePath(normalize(path));\n+        if (pathOutsideBase(filePath)) {\n+            return Optional.empty();\n+        }\n         try {\n             return Optional.of(Files.newInputStream(filePath));\n         } catch (IOException e) {\n@@ -79,7 +82,7 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     @Override\n     public Optional\u003cURL\u003e getResource(String path) {\n         Path filePath = getFilePath(normalize(path));\n-        if (Files.exists(filePath) \u0026\u0026 Files.isReadable(filePath) \u0026\u0026 !Files.isDirectory(filePath)) {\n+        if (!pathOutsideBase(filePath) \u0026\u0026 Files.exists(filePath) \u0026\u0026 Files.isReadable(filePath) \u0026\u0026 !Files.isDirectory(filePath)) {\n             try {\n                 URL url = filePath.toUri().toURL();\n                 return Optional.of(url);\n@@ -117,4 +120,15 @@ public class DefaultFileSystemResourceLoader implements FileSystemResourceLoader\n     private Path getFilePath(String path) {\n         return baseDirPath.map(dir -\u003e dir.resolve(path)).orElseGet(() -\u003e Paths.get(path));\n     }\n+\n+    private boolean pathOutsideBase(Path path) {\n+        if (baseDirPath.isPresent()) {\n+            Path baseDir = baseDirPath.get();\n+            if (path.isAbsolute() == baseDir.isAbsolute()) {\n+                Path relativePath = baseDir.relativize(path);\n+                return relativePath.startsWith(\"..\");\n+            }\n+        }\n+        return false;\n+    }\n }\n-- \n\n```\n\n### Workarounds\n\n- do not use ** in mapping, use only * which exposes only flat structure of a directory not allowing traversal\n- run micronaut in chroot (linux only)\n\n### References\n\nSee https://cwe.mitre.org/data/definitions/22.html\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [Github](https://github.com/micronaut-projects/micronaut-core/issues)\n* Email us at [info@micronaut.io](mailto:info@micronaut.io)\n","status":"published","published":"2021-07-26T21:15:08Z","modified":"2026-07-08T06:28:32.850434051Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"cwes":["CWE-22"],"updated_at":"2026-11-02T15:46:45.28161Z"}]}}