Medium
NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
Type: advisorySources: OSV
NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-33332
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 14:07 UTC · Revision 1
Source evidence
NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
core-osv · Original sourcePublished 24 Mar 2026, 19:20 UTC
NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.
osv:CVE-2026-33332
Complete source record
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"url": "https://osv.dev/vulnerability/CVE-2026-33332",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion",
"summary": "NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.",
"evidence": "osv:CVE-2026-33332",
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"GHSA-w5g8-5849-vj76",
"PYSEC-2026-2233"
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"provider": "osv",
"references": [
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"published_at": "2026-03-24T19:20:53.386+00:00"
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