CVE Explorer

CVE-2026-39844

NiceGUI is a Python-based UI framework. Prior to 3.10.0, Since PurePosixPath only recognizes forward slashes (/) as path separators, an attacker can bypass this sanitization on Windows by using backslashes (\) in the upload filename. Applications that construct file paths using file.name (a pattern demonstrated in NiceGUI's bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:420a9245558ce4c2274a314f82ae19f1e1b1aeb813733b9c5ab9a857dac83452

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"nicegui","vendor":"zauberzeug","versions":[{"status":"affected","version":"< 3.10.0"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion

{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","lang":"en","type":"CWE"}

cve_program_cvelist_v5cwe
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/zauberzeug/nicegui/commit/d38a702e3af2da5b0708f689be8d71413fc77056","tags":["x_refsource_MISC"],"url":"https://github.com/zauberzeug/nicegui/commit/d38a702e3af2da5b0708f689be8d71413fc77056"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/references/1

{"name":"https://github.com/zauberzeug/nicegui/releases/tag/v3.10.0","tags":["x_refsource_MISC"],"url":"https://github.com/zauberzeug/nicegui/releases/tag/v3.10.0"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/references/2

{"name":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-w8wv-vfpc-hw2w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-w8wv-vfpc-hw2w"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:954dd52547805beebabe3a7c761663a57f16b25261fd44f60cfc677e7410ff94 · sha256:6c7222ee9e449682… · /containers/cna/references/0

Attribution and limitations

CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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