maximhq Bifrost up to 1.5.16 IP Validation fetch.go isPublicIP access control

Summaryinfo

A vulnerability marked as problematic has been reported in maximhq Bifrost up to 1.5.16. This affects the function isPublicIP of the file core/providers/utils/fetch.go of the component IP Validation. Performing a manipulation results in access control. This vulnerability is known as CVE-2026-55245. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in maximhq Bifrost up to 1.5.16. This affects the function isPublicIP of the file core/providers/utils/fetch.go of the component IP Validation. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality. The summary by CVE is:

Bifrost is an enterprise AI gateway for routing requests to model providers. Prior to 1.5.17, the isPublicIP function in core/providers/utils/fetch.go, reached through FetchAndEncodeURL for Bedrock and Vertex image or document URLs, classifies Carrier-Grade NAT 100.64.0.0/10, IPv6 6to4 2002::/16, NAT64 64:ff9b::/96 and 64:ff9b:1::/48, and deprecated IPv6 site-local fec0::/10 addresses as public. A remote attacker who controls a multimodal request URL can make the gateway fetch internal services, including a cloud instance metadata endpoint encoded through 6to4 or NAT64. This issue is fixed in version 1.5.17.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-55245 since 06/16/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 1.5.17 eliminates this vulnerability.

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Productinfo

Vendor

• maximhq

Name

• Bifrost

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9
• 1.5.10
• 1.5.11
• 1.5.12
• 1.5.13
• 1.5.14
• 1.5.15
• 1.5.16

Website

• Product: https://github.com/maximhq/bifrost/

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