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CVE-2026-55245— Bifrost: SSRF deny-list incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL

Quick assessment

Affected
maximhq bifrost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Maxim AI Bifrost AI Gateway是Maxim AI组织开源的一款面向AI服务调用的智能网关。 Maxim AI Bifrost AI Gateway 1.5.17之前版本存在服务端请求伪造漏洞，该漏洞源于isPublicIP函数将运营商级NAT 100.64.0.0/10、IPv6 6to4 2002::/16、NAT64 64:ff9b::/96和64:ff9b:1::/48以及IPv6站点本地fec0::/10地址误分类为公网，可能导致远程攻击者通过控制多模态请求URL使网关获取

CVSS 8.7 · High EPSS 0.61% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
maximhq bifrost < 1.5.17 affected
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I. Basic Information for CVE-2026-55245

Vulnerability Information
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Vulnerability Title
Bifrost: SSRF deny-list incomplete: isPublicIP permits CGNAT, IPv6 6to4/NAT64, and site-local in FetchAndEncodeURL
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
Maxim AI Bifrost AI Gateway 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Maxim AI Bifrost AI Gateway是Maxim AI组织开源的一款面向AI服务调用的智能网关。 Maxim AI Bifrost AI Gateway 1.5.17之前版本存在服务端请求伪造漏洞，该漏洞源于isPublicIP函数将运营商级NAT 100.64.0.0/10、IPv6 6to4 2002::/16、NAT64 64:ff9b::/96和64:ff9b:1::/48以及IPv6站点本地fec0::/10地址误分类为公网，可能导致远程攻击者通过控制多模态请求URL使网关获取
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
maximhq bifrost < 1.5.17 -

II. Public POCs for CVE-2026-55245

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III. Intelligence Information for CVE-2026-55245

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Patches & Fixes for CVE-2026-55245 (3)

Vendor Advisories for CVE-2026-55245 (1)

IV. Related Vulnerabilities

Same product: bifrost
Same vendor: maximhq
Same weakness: CWE-918