jack lets users share media libraries through their Radarr/Sonarr stack, peer-to-peer.
CVE-2026-62979
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…
Assessment
- CVSS
- 8.4 (v4.0)
- Severity
- High
- Known exploited
- Not listed in CISA KEV
- Exploit availability
- Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
- Published
- 30 October 2026
- Last updated
- 30 October 2026
- Affected
- roziscoding
- Assigner
- GitHub_M
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:N
At the source
References
Query this programmatically
Agents can read this through the MCP endpoint, or over HTTP:
curl https://cve.zerocrew.in/api/cve/CVE-2026-62979