EUVD-2026-71141
GHSA-wc5f-hgwx-ffx9
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/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:X/V:X/RE:X/U:X
Network-exploitable SSRF gated by low-privilege auth; confidentiality-only impact via metadata credential disclosure; dual-stack is common enough in cloud deployments to keep AC:L.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
Lifecycle Timeline
2DescriptionCVE.org
Nightingale (n9e), as of commit 8362cbe (main branch, confirmed 2026-08-27), contains a server-side request forgery vulnerability in the isPublicIP function in aiagent/tools/http.go, the SSRF guard for the http_fetch AI-agent tool. The function only unwraps standard IPv4-mapped (::ffff:a.b.c.d) IPv6 addresses before checking them against the forbidden-range list, and does not classify 6to4 (2002::/16), NAT64 (64:ff9b::/96, 64:ff9b:1::/48), or deprecated site-local (fec0::/10) addresses. On a dual-stack or NAT64-enabled host, an attacker able to supply a URL to the http_fetch tool can bypass the guard by encoding a forbidden IPv4 address (such as the cloud instance-metadata endpoint 169.254.169.254) in one of these IPv6 forms to reach internal or metadata services.
AnalysisAI
Server-side request forgery in Nightingale (n9e), the open-source observability platform by ccfos, allows authenticated users of the http_fetch AI-agent tool to bypass the platform's SSRF guard by encoding forbidden IPv4 addresses using 6to4, NAT64, or deprecated site-local IPv6 representations. The isPublicIP function in aiagent/tools/http.go only unwraps standard ::ffff:a.b.c.d IPv4-mapped IPv6 addresses before applying the forbidden-range check, leaving 2002::/16 (6to4), 64:ff9b::/96 and 64:ff9b:1::/48 (NAT64), and fec0::/10 (site-local) unrecognized and passable as 'public'. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires authenticated access to the Nightingale instance with permission to invoke the http_fetch AI-agent tool (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 score of 7.1 (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N) captures the core risk accurately: the vulnerability is network-exploitable with low complexity but is gated behind low-privilege authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version has been independently confirmed at time of analysis. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: disable the http_fetch AI-agent tool in Nightingale or restrict it via firewall rules blocking access to 169.254.169.254 and internal subnets; audit logs for suspicious requests using IPv6 encoding (6to4, NAT64, site-local ranges) or targeting metadata endpoints. …
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More in Nightingale
View allSame weakness CWE-918 – Server-Side Request Forgery (SSRF)
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External POC / Exploit Code
Leaving vuln.today