GHSA-w5g8-5849-vj76

Suggest an improvement
Source
https://github.com/advisories/GHSA-w5g8-5849-vj76
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-w5g8-5849-vj76/GHSA-w5g8-5849-vj76.json
JSON Data
https://api.osv.dev/v1/vulns/GHSA-w5g8-5849-vj76
Aliases
Published
2026-03-19T18:48:27Z
Modified
2026-03-27T22:04:50.847264Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
  • 6.9 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N CVSS Calculator
Summary
NiceGUI's unvalidated chunk size parameter in media routes can cause memory exhaustion
Details

Summary

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.

Impact

Affected applications: NiceGUI applications that serve media content via app.add_media_file() or app.add_media_files(), particularly those serving large files (video, audio).

What an attacker can do: - Force the server to load entire files into memory instead of streaming them in chunks - Amplify memory usage with concurrent requests to large media files - Cause performance degradation, memory pressure, and potential OOM conditions

Attack difficulty: Low - requires only a crafted query parameter.

Remediation

Upgrade to a patched version of NiceGUI.

As a workaround, restrict access to media endpoints or strip unexpected query parameters at a reverse proxy layer.

Database specific 
{
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-19T18:48:27Z",
    "severity": "MODERATE",
    "nvd_published_at": "2026-03-24T20:16:28Z",
    "cwe_ids": [
        "CWE-20",
        "CWE-770"
    ]
}
References

Affected packages

PyPI / nicegui

Package

Name
nicegui
View open source insights on deps.dev
Purl
pkg:pypi/nicegui

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.9.0

Affected versions

0.*
0.1.0
0.1.4
0.1.6
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.2.9
0.2.10
0.2.11
0.2.12
0.2.13
0.2.14
0.2.15
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
0.3.6
0.3.7
0.3.8
0.3.9
0.4.0
0.4.1
0.4.2
0.4.3
0.4.4
0.4.5
0.4.6
0.4.7
0.4.8
0.4.9
0.4.10
0.4.11
0.4.12
0.4.13
0.4.14
0.4.15
0.5.0
0.5.1
0.5.2
0.5.3
0.5.4
0.5.5
0.5.6
0.5.7
0.5.8
0.5.9
0.5.10
0.5.11
0.5.12
0.6.0
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.6.7
0.6.8
0.6.9
0.6.10
0.6.11
0.6.12
0.6.13
0.7.0
0.7.1
0.7.2
0.7.3
0.7.4
0.7.6
0.7.7
0.7.8
0.7.9
0.7.10
0.7.11
0.7.12
0.7.13
0.7.14
0.7.15
0.7.16
0.7.17
0.7.18
0.7.19
0.7.21
0.7.22
0.7.23
0.7.24
0.7.25
0.7.26
0.7.27
0.7.28
0.7.29
0.7.30
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
0.8.10
0.8.11
0.8.12
0.8.13
0.8.14
0.8.15
0.8.16
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.7
0.9.8
0.9.9
0.9.10
0.9.11
0.9.12
0.9.13
0.9.14
0.9.15
0.9.16
0.9.17
0.9.18
0.9.19
0.9.20
0.9.21
0.9.22
0.9.23
0.9.24
0.9.25
0.9.26
0.9.27
0.9.28
1.*
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.0.9
1.0.10
1.1.0
1.1.1
1.1.2
1.1.3
1.1.4
1.1.5
1.1.6
1.1.7
1.1.8
1.1.9
1.1.10
1.1.11
1.2.0
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
1.2.7
1.2.8
1.2.9
1.2.10
1.2.11
1.2.12
1.2.13
1.2.14
1.2.15
1.2.16
1.2.17
1.2.18
1.2.20
1.2.21
1.2.22
1.2.23
1.2.24
1.3.0
1.3.1
1.3.2
1.3.3
1.3.4
1.3.5
1.3.6
1.3.7
1.3.8
1.3.9
1.3.10
1.3.11
1.3.12
1.3.13
1.3.14
1.3.15
1.3.16
1.3.17
1.3.18
1.4.0
1.4.1
1.4.2
1.4.3
1.4.4
1.4.5
1.4.6
1.4.7
1.4.8
1.4.9
1.4.10
1.4.11
1.4.12
1.4.13
1.4.14
1.4.15
1.4.16
1.4.17
1.4.18
1.4.19
1.4.20
1.4.21
1.4.22
1.4.23
1.4.24
1.4.25
1.4.26
1.4.27
1.4.28
1.4.29
1.4.30
1.4.31
1.4.33
1.4.34
1.4.35
1.4.36
1.4.37
2.*
2.0.0
2.0.1
2.1.0
2.2.0
2.3.0
2.4.0
2.5.0
2.7.0
2.8.0
2.8.1
2.9.0
2.9.1
2.10.0
2.10.1
2.11.0
2.11.1
2.12.0
2.12.1
2.13.0
2.14.0
2.14.1
2.15.0
2.16.0
2.16.1
2.17.0
2.18.0
2.19.0
2.20.0
2.21.0
2.21.1
2.22.0
2.22.1
2.22.2
2.23.0
2.23.1
2.23.2
2.23.3
2.24.0
2.24.1
2.24.2
3.*
3.0.0rc1
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.1.0
3.2.0
3.3.0
3.3.1
3.4.0
3.4.1
3.5.0
3.6.0
3.6.1
3.7.0
3.7.1
3.8.0

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/03/GHSA-w5g8-5849-vj76/GHSA-w5g8-5849-vj76.json"
last_known_affected_version_range 
"<= 3.8.0"