CVSS 4.0
8.7 highCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:NCVE-2026-55245
High (8.7). EPSS 0.6% chance of exploitation in the next 30 days. Fixed in github.com/maximhq/bifrost/core 1.5.17.
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.
Severity
- EPSS
- 0.6% chance of exploitation in the next 30 days; higher than 49% of CVEs (scores of 2026-10-31)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-w98g-5w9p-p3rc | Go | github.com/maximhq/bifrost/core | <1.5.17 | 1.5.17 |
| GO-2026-6320 | Go | github.com/maximhq/bifrost/core | <1.5.17 | 1.5.17 |
References
- 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