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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.

Bifrost 是一个用于将请求路由至模型提供商的企业级 AI 网关。在 1.5.17 版本之前，通过针对 Bedrock 和 Vertex 的图像或文档 URL 调用 时， 中的 函数将以下地址范围错误地归类为“公共 IP”： 运营商级 NAT（CGNAT）地址段 100.64.0.0/10 IPv6 6to4 地址段 2002::/16 NAT64 地址段 64:ff9b::/96 和 64:ff9b:1::/48 已弃用的 IPv6 站点本地地址段 fec0::/10 攻击者若能控制多模态请求中的 URL（例

CVSS 8.7 · High

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

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 weakness: CWE-918

V. Comments for CVE-2026-55245

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