Python
CVE-2026-25732
HIGH
GHSA-9ffm-fxg3-xrhh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Lifecycle Timeline
4DescriptionGitHub Advisory
NiceGUI is a Python-based UI framework. Prior to 3.7.0, NiceGUI's FileUpload.name property exposes client-supplied filename metadata without sanitization, enabling path traversal when developers use the pattern UPLOAD_DIR / file.name. Malicious filenames containing ../ sequences allow attackers to write files outside intended directories, with potential for remote code execution through application file overwrites in vulnerable deployment patterns. This design creates a prevalent security footgun affecting applications following common community patterns. Note: Exploitation requires application code incorporating file.name into filesystem paths without sanitization. Applications using fixed paths, generated filenames, or explicit sanitization are not affected. This vulnerability is fixed in 3.7.0.
AnalysisAI
Path traversal in NiceGUI before 3.7.0 allows remote attackers to write arbitrary files outside intended directories by exploiting unsanitized filename metadata in the FileUpload.name property, potentially leading to remote code execution when developers incorporate this value directly into file paths. Public exploit code exists for this vulnerability, affecting applications using common patterns like concatenating user-supplied filenames with upload directories. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | NiceGUI versions prior to 3.7.0 with FileUpload component where developers concatenate file.name directly to upload directory path (pattern: UPLOAD_DIR / file.name) without sanitization. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.5 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker could exploit this vulnerability to write files outside intended directories, with potential for remote code executi. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all applications using NiceGUI and identify those with FileUpload functionality; assess exposure level based on whether uploads are from trusted or untrusted sources. …
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