CVE-2026-63088 stoatchat CVE debrief

Who should care

Users of stoatchat versions prior to 0.14.0 should be aware of this vulnerability and take steps to mitigate it. This vulnerability is particularly concerning for users who expose stoatchat to untrusted networks or allow unauthenticated access.

Technical summary

The stoatchat application before version 0.14.0 is vulnerable to server-side request forgery (SSRF). The url_is_blacklisted function does not properly validate addresses, as it only checks the first resolved address. Meanwhile, the underlying HTTP client iterates over all cached addresses, potentially allowing attackers to bypass the DNS-based IP blocklist. This issue can be exploited by unauthenticated attackers with network access.

Defensive priority

High priority should be given to updating stoatchat to version 0.14.0 or later. In the meantime, users should consider implementing additional security measures to restrict access to the stoatchat application and monitor for suspicious activity.

Recommended defensive actions

• Update stoatchat to version 0.14.0 or later
• Restrict access to the stoatchat application to trusted networks and users
• Monitor stoatchat logs for suspicious activity
• Consider implementing additional security controls to detect and prevent SSRF attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record was published on 2026-07-16T17:16:58.833Z and has not been modified since then. The NVD entry is currently Deferred. The stoatchat application before version 0.14.0 is vulnerable to server-side request forgery (SSRF). The url_is_blacklisted function does not properly validate addresses, as it only checks the first resolved address. Meanwhile, the underlying HTTP client iterates over all cached addresses, potentially allowing attackers to bypass the DNS-based IP blocklist. This issue can be exploited by unauthenticated attackers with network access. Users of stoatchat versions prior to 0.14.0 should be aware of this vulnerability and take steps to mitigate it. This vulnerability is particularly concerning for users who expose stoatchat to untrusted networks or allow unauthenticated access.

Official resources