CVE-2026-102598

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Source
https://cve.org/CVERecord?id=CVE-2026-102598
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-102598.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-102598
Aliases
  • GHSA-g6x2-hccm-hh4m
Downstream
Related
Published
2026-09-29T15:16:28Z
Modified
2026-10-03T03:45:42Z
Severity
  • 6.3 (Medium) CVSS_V4 - 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 CVSS Calculator
Summary
Werkzeug safe_join() allows Windows special device names
Details

Werkzeug is a comprehensive WSGI web application library. Prior to 3.1.9, the safe_join function used by send_from_directory can allow a NUL: special-device path because safe_join checks the Windows device name without first removing an empty NTFS ADS marker. The trigger is that an application runs on Windows with NTFS and serves a user-specified path ending in a special device name such as NUL:. The attack mechanism is that a requested path ends in a Windows special device name with an empty ADS marker. The impact is that the special device opens successfully and the file read hangs indefinitely. This issue is fixed in version 3.1.9.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-67"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102598.json"
}
References

Affected packages

Git / github.com/pallets/werkzeug

Affected ranges

Type
GIT
Repo
https://github.com/pallets/werkzeug
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
8d77320bcdf3a34941ec06dcf16b03c065cd21b6
Fixed
6604c3b8784ecc7cf5ac0b7412d916989b4c7d45
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "3.1.9"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.1
0.10
0.11
0.12
0.13
0.14
0.15.0
0.2
0.3
0.4
0.4.1
0.6
0.6.1
0.6.2
0.7
0.8
0.9
1.*
1.0.0
1.0.0rc1
2.*
2.0.0
2.0.0rc1
2.0.0rc2
2.0.0rc3
2.0.0rc4
2.0.0rc5
2.1.0
2.2.0
2.2.0a1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-102598.json"