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- The CVE-2026-77564 vulnerability affects Sidero Labs Talos Linux support bundle generation utility.
- When operators execute the diagnostic collection command, sensitive configurations are gathered.
- Private registry authentication tokens and credentials are included without proper masking.
- Specifically, the internal resource file registryconfigs.cri.talos.dev.yaml retains plaintext specs.
- The auth field containing sensitive authorization parameters remains completely unredacted.
- Additional sensitive configuration data is similarly exposed within etcfilespecs.files.talos.dev.yaml.
- This cleartext storage violates secure handling principles for secret authentication material.
- Support bundles are routinely uploaded to public platforms like GitHub issues or Slack threads.
- Operators often share these archives for troubleshooting assistance without realizing secrets are embedded.
- Unintended third parties who access these public archives can extract internal registry keys.
- If the target private registry is reachable over the public internet, the risk escalates.
- Leaked credentials with write permissions allow malicious actors to interact directly with the registry.
- This exposure can enable unauthorized image pushes, deletions, or modifications.
- Consequences range from localized denial of service conditions to catastrophic data loss.
- Furthermore, attackers can hijack existing container image tags within the private registry.
- Such tag hijacking paves the way for sophisticated software supply chain compromises.
- Affected parties are frequently under the false impression that logs are automatically scrubbed.
- Diagnostic tooling historically failed to sanitize registry authentication parameters before packaging.
- The vulnerability requires user interaction where an operator generates and shares the bundle.
- Successful exploitation grants attackers unauthorized confidentiality access to private registry secrets.
- Environmental factors such as network isolation reduce immediate exploitation feasibility.
- However, credential reuse across multiple systems can amplify the overall blast radius.
- Mitigation requires upgrading Talos to secure versions where redaction logic is correctly implemented.
- Alternatively, newer Talos releases enforce bundle encryption by default to mitigate exposure.
- Security teams must audit historical support bundles shared in public forums.
- Any potentially exposed registry secrets must be immediately rotated and revoked.
- Access control lists on private registries should be reviewed for anomalous activities.
- Automated pipeline scanners can help detect accidental secret leakage in shared artifacts.
- Understanding this mechanism emphasizes the critical need for strict output sanitization in CLI tools.
- Proper handling ensures diagnostic utilities do not become vectors for credential disclosure.
DailyCVE Form:
Platform: Talos Linux
Version: v1.13.0
Vulnerability: Information Disclosure
Severity: Medium
date: August 24 2026
Prediction: Already Patched
What Undercode Say
Generate cluster support bundle containing unredacted configs talosctl -n 192.168.1.10 support Extract and check registry configurations for plaintext auth tokens unzip support.zip -d extracted_bundle cat extracted_bundle/resources/registryconfigs.cri.talos.dev.yaml cat extracted_bundle/etcfilespecs.files.talos.dev.yaml
Exploit: (Educational Purposes!)
To verify this vulnerability, an operator runs the diagnostic support command on a cluster configured with a RegistryAuthConfig resource. Inspecting the resulting bundle’s registry configuration files demonstrates that authentication parameters are retained in plaintext rather than being masked or scrubbed.
Protection: from this CVE
Upgrade Talos Linux to version 1.12.9, 1.13.3, or later.
Utilize Talos 1.14+ default bundle encryption features.
Avoid uploading unredacted diagnostic archives to public issue trackers or chat forums.
Promptly rotate registry credentials if logs were shared publicly.
Impact:
Exposure of private registry authentication parameters allows unauthorized parties with network connectivity to read, write, or modify images. This can lead to service disruptions, data loss, and image tag hijacking culminating in supply chain compromise.
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Sources:
Reported By: github.com
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