Live › vulnerability › CVE-2026-62979
jack returns raw error objects over HTTP, and those errors include outbound request headers. An attacker with the shared peer key can read the internal Radarr/Sonarr X-Api-Key and Cloudflare Access secrets, which grants full administrative control of those instances.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-30 21:25 UTC. All times on this page are UTC.
Deployments running jack before 0.1.0 that connect to Radarr or Sonarr are exposed, since the leaked keys come from upstream error responses. Exposure needs a valid shared peer API key, and Cloudflare Access credentials too if the deployment requires them. Installs on 0.1.0 or later, or setups without these connectors, can skip it.
No product ranges from the sources yet.
0.1.0 are affected.GET /peer/items/:id, GET /servers/health and GET /torznab/download/:id routes in your deployment.X-Api-Key or CF-Access-Client-Secret headers.0.1.0 or later.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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