ankitects/anki · Security
Anki's local HTTP server does not sufficiently validate requests
- GHSA ID
- GHSA-869j-r97x-hx2g
- CVE ID
- CVE-2026-59153
- Severity
- high
- Published
- Updated
- CVSS v4
- 8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Description
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
CWEs
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CWE-346 · Origin Validation Error
References
- https://github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2g ↗
- https://x.com/taviso/status/2051310678800253318 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2026-59153 ↗
- https://github.com/ankitects/anki/commit/858e5689d0e4fd24f74856c7e8f245412694a219 ↗
- https://github.com/ankitects/anki/releases/tag/25.09.3 ↗
- https://github.com/advisories/GHSA-869j-r97x-hx2g ↗