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GHSA-29VQ-49WR-VM6X
Vulnerability from github – Published: 2026-02-19 20:32 – Updated: 2026-02-23 22:27Werkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "werkzeug"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.1.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-27199"
],
"database_specific": {
"cwe_ids": [
"CWE-67"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-19T20:32:45Z",
"nvd_published_at": "2026-02-21T06:17:00Z",
"severity": "MODERATE"
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "GHSA-29vq-49wr-vm6x",
"modified": "2026-02-23T22:27:37Z",
"published": "2026-02-19T20:32:45Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names"
}
BREW-ICLOUDPD-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:59 – Updated: 2026-09-10 00:11 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": null,
"range_state": "affected",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.4",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "icloudpd",
"purl": "pkg:brew/icloudpd"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.4",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.4"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-icloudpd-CVE-2026-27199",
"modified": "2026-09-10T00:11:17Z",
"published": "2026-08-13T16:59:03Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-KEEPER-COMMANDER-CV… (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:01 – Updated: 2026-09-17 18:04 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "keeper-commander",
"purl": "pkg:brew/keeper-commander"
},
"ranges": [
{
"events": [
{
"introduced": "17.0.20"
},
{
"fixed": "17.2.8"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-keeper-commander-CVE-2026-27199",
"modified": "2026-09-17T18:04:36Z",
"published": "2026-08-13T17:01:22Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-LOCUST-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:03 – Updated: 2026-09-17 20:07 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "locust",
"purl": "pkg:brew/locust"
},
"ranges": [
{
"events": [
{
"introduced": "2.2.1"
},
{
"fixed": "2.43.3_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-locust-CVE-2026-27199",
"modified": "2026-09-17T20:07:56Z",
"published": "2026-08-13T17:03:02Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-MAIGRET-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:11 – Updated: 2026-09-17 19:20 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "maigret",
"purl": "pkg:brew/maigret"
},
"ranges": [
{
"events": [
{
"introduced": "0.5.0"
},
{
"fixed": "0.5.0_5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-maigret-CVE-2026-27199",
"modified": "2026-09-17T19:20:01Z",
"published": "2026-08-13T17:11:30Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-MAPPROXY-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:11 – Updated: 2026-09-17 19:13 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "mapproxy",
"purl": "pkg:brew/mapproxy"
},
"ranges": [
{
"events": [
{
"introduced": "2.1.1"
},
{
"fixed": "6.0.1_4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-mapproxy-CVE-2026-27199",
"modified": "2026-09-17T19:13:27Z",
"published": "2026-08-13T17:11:34Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-MCPM-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:13 – Updated: 2026-09-17 19:39 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "mcpm",
"purl": "pkg:brew/mcpm"
},
"ranges": [
{
"events": [
{
"introduced": "2.12.0"
},
{
"fixed": "2.13.0_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-mcpm-CVE-2026-27199",
"modified": "2026-09-17T19:39:23Z",
"published": "2026-08-13T17:13:14Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-MOTO-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:14 – Updated: 2026-09-22 01:48 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "moto",
"purl": "pkg:brew/moto"
},
"ranges": [
{
"events": [
{
"introduced": "2.0.2"
},
{
"fixed": "5.1.21_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-moto-CVE-2026-27199",
"modified": "2026-09-22T01:48:27Z",
"published": "2026-08-13T17:14:37Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-PROWLER-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:29 – Updated: 2026-09-30 20:15 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.9",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "prowler",
"purl": "pkg:brew/prowler"
},
"ranges": [
{
"events": [
{
"introduced": "4.1.0"
},
{
"fixed": "5.18.3_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.9",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.9"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-prowler-CVE-2026-27199",
"modified": "2026-09-30T20:15:08Z",
"published": "2026-08-13T17:29:23Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-RECON-NG-CVE-2026-27199 (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:32 – Updated: 2026-09-10 01:05 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": null,
"range_state": "affected",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.4",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "recon-ng",
"purl": "pkg:brew/recon-ng"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.4",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.4"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-recon-ng-CVE-2026-27199",
"modified": "2026-09-10T01:05:54Z",
"published": "2026-08-13T17:32:25Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
BREW-SCHEMATHESIS-CVE-20… (GHSA-29VQ-49WR-VM6X)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:34 – Updated: 2026-09-17 19:13 – Source websiteWerkzeug's safe_join function allows Windows device names as filenames if when preceded by other path segments.
This was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL.
send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.1.6"
},
"package": {
"ecosystem": "Homebrew",
"name": "schemathesis",
"purl": "pkg:brew/schemathesis"
},
"ranges": [
{
"events": [
{
"introduced": "3.17.2"
},
{
"fixed": "4.10.2_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug\u0027s `safe_join` function allows Windows device names as filenames if when preceded by other path segments.\n\nThis was previously reported as https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that `safe_join` accepts paths with multiple segments, such as `example/NUL`.\n\n`send_from_directory` uses `safe_join` to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely.",
"id": "BREW-schemathesis-CVE-2026-27199",
"modified": "2026-09-17T19:13:04Z",
"published": "2026-08-13T17:34:18Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-29vq-49wr-vm6x"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27199"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f407712fdc60a09c2b3f4fe7db557703e5d9338d"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/releases/tag/3.1.6"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": " Werkzeug safe_join() allows Windows special device names",
"upstream": [
"GHSA-29vq-49wr-vm6x",
"CVE-2026-27199",
"PYSEC-2026-2320"
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.