CVE-2026-55245Public exploitNetwork attack vectorHinoki check available

Unauthenticated SSRF via incomplete IP classification

Published Aug 28, 2026 · Updated Aug 28, 2026

SSRF in Maxim AI Bifrost before 1.5.17 allows remote attackers to make the gateway request internal services via multimodal URLs. The isPublicIP guard in core/providers/utils/fetch.go treats CGNAT, 6to4, NAT64, and site-local addresses as public instead of rejecting them. A Bedrock or Vertex image or document URL is required; reachable targets include internal services and metadata endpoints on compatible networks.

CVSS severity8.7
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Maxim AI Bifrost before 1.5.17 allows remote attackers to make the gateway request internal services via multimodal URLs. The isPublicIP guard in core/providers/utils/fetch.go treats CGNAT, 6to4, NAT64, and site-local addresses as public instead of rejecting them. A Bedrock or Vertex image or document URL is required; reachable targets include internal services and metadata endpoints on compatible networks.

The record

CVE
CVE-2026-55245
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
Maxim AI
Product
Bifrost
Classifications
CWE-918, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.5.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Maxim AI · Bifrostversion=< 1.5.17

Published CVSS scores

8.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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