CVE-2026-59153: Anki's local HTTP server does not sufficiently validate requests

Severity: low (CVSS 2.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-07 · updated 2026-10-25
Weakness: CWE-346

Description

Anki is a program for creating and reviewing flashcards. Prior to 25.09.3, Anki launches a local HTTP server to serve media files and web pages for parts of its interface, but requests from other origins were not sufficiently blocked. A malicious website could potentially trigger side-effecting requests to the local server, with severity varying by browser depending on Private Network Access protections. This issue is fixed in version 25.09.3.

Affected products

Ankitects Anki: before 25.09.3

References

https://github.com/ankitects/anki/commit/858e5689d0e4fd24f74856c7e8f245412694a219
https://github.com/ankitects/anki/releases/tag/25.09.3
https://github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2g
https://x.com/taviso/status/2051310678800253318

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