CVE-2026-59153
Anki's local HTTP server does not sufficiently validate requests
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Active
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Anki's local HTTP server does not sufficiently validate requests
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.
- Record
CVE-2026-59153- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-346
- Updated
- 2026-11-02
EUVDEUVD-2026-42112
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.
- Record
EUVD-2026-42112- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-869j-r97x-hx2g
Anki's local HTTP server does not sufficiently validate requests
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
- Record
GHSA-869j-r97x-hx2g- CVSS 4.0
- 8.7 High
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 - Weakness
- CWE-22, CWE-346
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-59153- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Weakness
- CWE-346
- Updated
- 2026-11-02
OSV
Anki's local HTTP server does not sufficiently validate requests
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.
- Record
CVE-2026-59153- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Weakness
- CWE-346
- Updated
- 2026-11-02
OSVDEBIAN-CVE-2026-59153
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.
- Record
DEBIAN-CVE-2026-59153- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Updated
- 2026-11-02
OSVGHSA-869j-r97x-hx2g
Anki's local HTTP server does not sufficiently validate requests
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
- Record
GHSA-869j-r97x-hx2g- CVSS 4.0
- 8.7 High
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 - Weakness
- CWE-22, CWE-346
- Updated
- 2026-11-02
OSVPYSEC-2026-3459
Anki's local HTTP server does not sufficiently validate requests
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
- Record
PYSEC-2026-3459- CVSS 4.0
- 8.7 High
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 - Updated
- 2026-11-02
OSVUBUNTU-CVE-2026-59153
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.
- Record
UBUNTU-CVE-2026-59153- CVSS 4.0
- 2.1 Low
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
aqtPyPI |
through 25.9.2 | 25.9.3 |
aqtPyPI |
before 25.9.3, plus listed versions 2.1.242.1.252.1.262.1.282.1.29 Show 45 moreShow less2.1.302.1.312.1.322.1.332.1.342.1.352.1.362.1.372.1.37rc12.1.382.1.38b12.1.38b22.1.38b32.1.38b42.1.392.1.39b12.1.39b22.1.402.1.412.1.41b12.1.41b22.1.41b32.1.41b42.1.41b52.1.41b62.1.41b72.1.422.1.432.1.43b12.1.442.1.44b12.1.452.1.45a12.1.45a22.1.45a32.1.45a42.1.45b12.1.45b22.1.45b32.1.45b42.1.45b52.1.45b62.1.45rc12.1.45rc22.1.46 |
25.9.3 |
ankiUbuntu:16.04:LTS |
All versions, plus listed versions 2.0.32+dfsg-1 |
None known |
ankiUbuntu:18.04:LTS |
All versions, plus listed versions 2.1.0+dfsg~a12-0.12.1.0+dfsg~b24-12.1.0+dfsg~b25-12.1.0+dfsg~b26-12.1.0+dfsg~b27-1 Show 6 moreShow less2.1.0+dfsg~b29-12.1.0+dfsg~b31-12.1.0+dfsg~b33-12.1.0+dfsg~b34-12.1.0+dfsg~b35-12.1.0+dfsg~b36-1 |
None known |
ankiUbuntu:20.04:LTS |
All versions, plus listed versions 2.1.8+dfsg-1ubuntu12.1.15+dfsg-1 |
None known |
ankiUbuntu:22.04:LTS |
All versions, plus listed versions 2.1.15+dfsg-32.1.15+dfsg-3ubuntu0.1 |
None known |
ankiUbuntu:24.04:LTS |
All versions, plus listed versions 2.1.15+dfsg-3ubuntu12.1.15+dfsg-3ubuntu22.1.15+dfsg-3ubuntu32.1.15+dfsg-3ubuntu42.1.15+dfsg-3ubuntu4.1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-59153 is a low vulnerability (CVSS 2.1) in Ankitects Anki, published June 19, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 18th percentile. Fixed in aqt 25.9.3.
References
github.com/ankitects/anki/security/advisories/GHSA-869j-r97x-hx2g
x.com/taviso/status/2051310678800253318
nvd.nist.gov/vuln/detail/CVE-2026-59153
Left out here: 137 versions. The JSON record has them.