CVE-2026-62979
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
In jack before 0.1.0, middleware/handle-error.ts serializes raw FetchError objects into HTTP responses, and 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, exposing internal Radarr/Sonarr X-Api-Key and connector headers such as CF-Access-Client-Secret. The GET /peer/items/:id, GET /servers/health, and GET /torznab/download/:id endpoints can expose these secrets. The issue is fixed in version 0.1.0.
Risk Assessment
A client with the shared peer API key can force an error and obtain internal Radarr/Sonarr administrative keys and Cloudflare Access secrets. Disclosed keys grant full administrative control of the corresponding instances, crossing the intended boundary between peer access and private backend credentials.
Recommendation
Update jack to version 0.1.0 or later. Until then, restrict access to the /peer/items/:id, /servers/health, and /torznab/download/:id endpoints and rotate any exposed API keys and secrets.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS