Vulnerability Description
jack lets users share media libraries through their Radarr/Sonarr stack, peer-to-peer. Prior to 0.1.0, `middleware/handle-error.ts` serializes raw `FetchError` objects into HTTP responses. `lib/servers/base.ts` attaches outbound request headers on upstream non-success responses and schema-validation failures; the public `extras` field in `lib/errors/FetchError.ts` remains enumerable and is emitted by JSON serialization. These headers include the internal Radarr/Sonarr `X-Api-Key` and custom connector headers such as `CF-Access-Client-Secret`. `lib/redact.ts` redacts logs and spans but not this response path. Any client with the shared peer API key, plus Cloudflare Access credentials if required by the deployment, can force an error without a race or user interaction. `GET /peer/items/:id` and `GET /servers/health` can expose the internal media-server key, while `GET /torznab/download/:id` can expose another peer's key and Cloudflare Access secrets. The /peer/search and /items routes catch these errors and are not affected. Disclosed internal keys grant full administrative control of the corresponding Radarr/Sonarr instance, crossing the intended boundary between friends' shared peer access and private backend credentials. This issue is fixed in version 0.1.0.
Related Weaknesses (CWE)
References
- https://github.com/roziscoding/jack/commit/2b296b5137acca476f34a23b692dd8c04ae1f
- https://github.com/roziscoding/jack/releases/tag/v0.1.0
- https://github.com/roziscoding/jack/security/advisories/GHSA-8gw5-7585-4997
FAQ
What is CVE-2026-62979?
CVE-2026-62979 is a documented vulnerability. jack lets users share media libraries through their Radarr/Sonarr stack, peer-to-peer. Prior to 0.1.0, `middleware/handle-error.ts` serializes raw `FetchError` objects into HTTP responses. `lib/server...
How severe is CVE-2026-62979?
CVSS scoring is not yet available for CVE-2026-62979. Check NVD for updates.
Is there a patch for CVE-2026-62979?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.