Files on the host computer can be accessed from the Gradio interface

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

9.3 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N · score source

EPSS

• CVE-2021-43831: 3.85% estimated exploitation activity in the next 30 days; percentile 90.17 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Impact This is a vulnerability that affects anyone who creates and publicly shares Gradio interfaces using gradio<2.4.8. Because of the way that static files were being served, someone who generated a public Gradio link and shared it with others would potentially be exposing the files on the computer that generated the link, while the link was active. An attacker would be able to view the contents of a file on the computer if they knew the exact relative filepath. We do not have any evidence that this was ever exploited, but we treated the issue seriously and immediately took steps to mitigate it (see below) Response 1. We worked with @haby0 to immediately patch the issue and released a new version, gradio 2.5.0, within 24 hours of the issue being brought to our attention 2. We enabled a notification that is printed to anyone using an older version of gradio telling them to upgrade (see screenshot below) 3. We expanded our test suite to test for this vulnerability ensuring that our…

Published by the source

21 Jan 2022, 23:43 UTC

Last modified by the source

8 Jul 2026, 06:28 UTC

Source last checked

26 Oct 2026, 13:27 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-rhq2-3vr9-6mcr

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-rhq2-3vr9-6mcr

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2021-43831

Advisory: Files on the host computer can be accessed from the Gradio interface
IDs: CVE-2021-43831, GHSA-rhq2-3vr9-6mcr
Record: https://patchnext.com/advisories/cve-2021-43831 (revision 3, source checked 26 Oct 2026, 13:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: gradio 2.5.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI gradio: affected < 2.5.0; fixed in 2.5.0

## Suggested inspection (read-only)
- `python -m pip show gradio`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on gradio.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-rhq2-3vr9-6mcr (OSV record GHSA-rhq2-3vr9-6mcr lists affected ranges: PyPI gradio >=0 <2.5.0 (fixed))
- Verified: https://github.com/advisories/GHSA-rhq2-3vr9-6mcr (GitHub-reviewed advisory GHSA-rhq2-3vr9-6mcr lists affected ranges: PyPI gradio >=0 <2.5.0)

Commands are suggestions: review each one before running it.