Medium 6.5Published Sep 4, 2026

CVE-2026-85692Nightingale 9.1.1 SSRF Guard Bypass via IPv6 Encoding

Updated under an hour ago (2026-10-19 06:50 UTC)

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Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-918
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 4, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

ccfos nightingale ccfos:nightingale (from the name)	through 9.1.1	CNA record

References

https://github.com/ccfos/nightingale/issues/3363issue-tracking
https://github.com/ccfos/nightingaleproduct
https://github.com/ccfos/nightingale/blob/v9.1.1/aiagent/tools/http.gotechnical-description
https://www.vulncheck.com/advisories/nightingale-9.1.1-ssrf-guard-bypass-via-ipv6-encodingthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.