CVE-2026-29023 is a vulnerability classified under CWE-798 (Use of Hard-coded Credentials) affecting KeygraphHQ's Shannon product, specifically version 0. The flaw arises from a hard-coded API key embedded in the router configuration, which is used for authenticating requests when the router component is enabled and exposed externally. Because the key is static and publicly known, any network attacker who can reach the router port can authenticate without any privileges or user interaction. This unauthorized access enables attackers to proxy API requests through the Shannon instance, effectively using the victim’s configured upstream provider API credentials. This can lead to unauthorized API calls, potential data leakage of proxied requests and responses, and abuse of the victim’s API quota or privileges. The vulnerability does not require authentication or user interaction, increasing its exploitability. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N) reflects network attack vector, low attack complexity, no privileges or user interaction required, and low to medium impact on confidentiality, integrity, and availability. The vendor has mitigated the general exploitability with a commit identified as 023cc95, although no official patch link is provided. Organizations running affected versions with exposed router components are at risk and should remediate promptly.

The impact of CVE-2026-29023 is significant for organizations using KeygraphHQ Shannon with the router component enabled and exposed to untrusted networks. Attackers can exploit the hard-coded API key to gain unauthorized access to the router, proxying API requests through the victim’s configured upstream provider credentials. This can lead to unauthorized API usage, potentially incurring financial costs, exhausting API quotas, or triggering rate limits. Additionally, sensitive data contained in proxied requests and responses may be disclosed, compromising confidentiality. The integrity of API interactions can be undermined by maliciously crafted requests, and availability may be affected if attackers flood the API or router with requests. Since exploitation requires only network access to the router port and no authentication or user interaction, the attack surface is broad if the router is exposed. Organizations relying on Shannon in critical infrastructure or handling sensitive data via upstream APIs face heightened risk of operational disruption and data breaches.

To mitigate CVE-2026-29023, organizations should first verify if the router component of Shannon is enabled and exposed to untrusted networks. If exposure is unnecessary, disable the router component entirely to eliminate the attack vector. If the router must be used, immediately update Shannon to a version containing the fix introduced in commit 023cc95 or later, which removes or replaces the hard-coded API key. In the absence of an official patch, implement network-level controls such as firewall rules or access control lists to restrict access to the router port to trusted hosts only. Additionally, monitor API usage logs for unusual or unauthorized activity that could indicate exploitation attempts. Rotate any upstream provider API credentials that may have been exposed or abused. Finally, review the application’s configuration management and deployment processes to prevent hard-coded credentials and enforce secure credential storage practices moving forward.