CVE-2026-34531

python-flask-httpauth: Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes

CVE-2026-34531 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-34531, released April 1, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
8.2
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0034
27th percentile

Flask-HTTPAuth provides Basic, Digest and Token HTTP authentication for Flask routes. Prior to version 4.8.1, in a situation where the client makes a request to a token protected resource without passing a token, or passing an empty token, Flask-HTTPAuth would invoke the application's token verification callback function with the token argument set to an empty string. If the application had any users in its database with an empty string set as their token, then it could potentially authenticate the client request against any of those users. This issue has been patched in version 4.8.1.

Where it's fixed

ProductFixed inFixReleased
Linux
python-Flask-HTTPAuth · opensuse-leap 16.0 4.8.0-bp160.2.1 OPENSUSE-SU-2026:20576-1 Apr 13, 2026
python-flask-httpauth · Debian 14 4.8.1-1.1 DEBIAN-CVE-2026-34531 Apr 1, 2026
python-flask-httpauth · Fedora 43 4.8.1-1.fc43 FEDORA-2026-04D6F223E0 Apr 7, 2026
python-flask-httpauth-doc · Fedora 43 4.8.1-1.fc43 FEDORA-2026-04D6F223E0 Apr 7, 2026
python3-flask-httpauth · Fedora 43 4.8.1-1.fc43 FEDORA-2026-04D6F223E0 Apr 7, 2026

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