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Open redirect endpoint in Datasette

Low severity GitHub Reviewed Published Nov 5, 2025 in simonw/datasette • Updated Nov 6, 2025

Package

pip datasette (pip)

Affected versions

< 0.65.2
>= 1.0a0, < 1.0a20

Patched versions

0.65.2
1.0a21

Description

Impact

Deployed instances of Datasette prior to 0.65.2 and 1.0a21 include an open redirect vulnerability.

Hits to the path //example.com/foo/bar/ (the trailing slash is required) will redirect the user to https://example.com/foo/bar.

Patches

This problem has been patched in both Datasette 0.65.2 and 1.0a21.

Workarounds

If Datasette is running behind a proxy that proxy could be configured to replace // with / in incoming request URLs.

References

@simonw simonw published to simonw/datasette Nov 5, 2025
Published to the GitHub Advisory Database Nov 6, 2025
Reviewed Nov 6, 2025
Last updated Nov 6, 2025

Severity

Low

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

EPSS score

Weaknesses

URL Redirection to Untrusted Site ('Open Redirect')

A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. Learn more on MITRE.

CVE ID

CVE-2025-64481

GHSA ID

GHSA-w832-gg5g-x44m

Source code

Credits

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