GHSA-869j-r97x-hx2g
Anki's local HTTP server does not sufficiently validate requests
Packages
Details
As written in the advisory (Markdown source, shown as plain text).
## Summary
Anki launches a local HTTP server to serve media files and web pages for parts of its interface. While the server has a CORS setup, requests from other origins were not blocked, allowing malicious websites to potentially trigger side-effecting requests.
## Browser impact
The severity varies by browser because of Private Network Access (PNA), a newer spec that restricts web pages from making requests to localhost/local network addresses:
Chrome/Chromium (including Edge, Brave): Largely protected, as Chrome has implemented PNA restrictions for several years and now puts local network access behind a permission prompt.
Safari: Hasn't implemented PNA yet, though macOS has some OS-level protections.
Firefox: Most vulnerable — hasn't implemented PNA yet, though it's reportedly planned for Firefox 151.
## Patches
The issue was fixed as of Anki 25.09.3
### References
https://x.com/taviso/status/2051310678800253318
References
External links from the advisory. They lead to third-party sites.
- https://github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2g
- https://nvd.nist.gov/vuln/detail/CVE-2026-59153
- https://github.com/ankitects/anki/commit/858e5689d0e4fd24f74856c7e8f245412694a219
- https://github.com/ankitects/anki
- https://github.com/ankitects/anki/releases/tag/25.09.3
- https://x.com/taviso/status/2051310678800253318