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Vulnerability record · CVE-2026-55245 · published 28 August 2026

CVE-2026-55245: Server-side request forgery (SSRF) vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.61% · top 52.9% CWE-918 · Server-side request forgery (SSRF) Deferred
8.7CVSS 4.0 base score
0.61%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
9 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/maximhq/bifrost/commit/54ec431fc5255ff42c36420d88549477e0b33d89
https://github.com/maximhq/bifrost/pull/4092
https://github.com/maximhq/bifrost/releases/tag/core/v1.5.17
https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc
https://github.com/maximhq/bifrost/security/advisories/GHSA-w98g-5w9p-p3rc

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Source: NIST National Vulnerability Database (record CVE-2026-55245), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.