CVE-2026-50192 Kerberos Hub private key (X-Kerberos-Hub-PrivateKey) leaked to cross-host redirect target due to redirect-following HTTP client without CheckRedirect
Kerberos Agent leaks private hub credentials to third-party redirect targets due to missing redirect checks, allowing attackers to intercept sensitive authentication keys.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-50192?
CVE-2026-50192 is a medium-severity vulnerability in kerberos-io agent, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Kerberos Agent is an open source video (surveillance) management agent. Prior to version 3.6.26, the Kerberos Hub upload path sends the agent's Hub credentials in the custom `X-Kerberos-Hub-PrivateKey` and `X-Kerberos-Hub-PublicKey` request headers to the operator-configured Hub URL (`config.HubURI`). The HTTP client used (`&http.Client{}` in `UploadKerberosHub`) is constructed without a `CheckRedirect` policy, so it follows HTTP redirects automatically. Go's `net/http` strips only sensitive headers (`Authorization`, `Cookie`, `WWW-Authenticate`) on a cross-host redirect; it does not strip custom headers such as `X-Kerberos-Hub-PrivateKey`. As a result, if the configured `HubURI` returns a cross-host 30x redirect, the Hub private key is forwarded verbatim to the redirect target, disclosing the credential to an unintended third party. Version 3.6.26 fixes the issue by implementing the `CheckRedirect` strip plus a cross-host regression test is provided to the maintainer through the advisory's private temporary fork.
Which versions are affected by CVE-2026-50192?
3 open source packages ship an affected version, including github.com/kerberos-io/agent/machinery.
| Package | Affected | Fixed in |
|---|---|---|
github.com/kerberos-io/agent/machinery Go | All versions | 0.0.0-20260528173546-51f1a52e170f |
github.com/kerberos-io/agent/machinery Go | All versions | 0.0.0-20260528173546-51f1a52e170f |
github.com/kerberos-io/agent/machinery Go | All versions | 0.0.0-20260528173546-51f1a52e170f |
How do I fix CVE-2026-50192?
Upgrade github.com/kerberos-io/agent/machinery to 0.0.0-20260528173546-51f1a52e170f or later.
Is CVE-2026-50192 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-50192 exists.
Sources
Also known as GHSA-h5gx-45rj-2h5j, GO-2026-5890.