SSRF in Ccfos Nightingale
CVE-2026-85692
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/ccfos/nightingale (product)
- github.com/ccfos/nightingale/blob/v9.1.1/aiagent/tools/http.go (technical-description)
- github.com/ccfos/nightingale/issues/3363 (issue-tracking)
- www.vulncheck.com/advisories/nightingale-9.1.1-ssrf-guard-bypass-via-ipv6-encod… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85692?
- CVE-2026-85692 is a medium-severity vulnerability in Ccfos Nightingale, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.5/10. Published 2026-09-04.
- How severe is CVE-2026-85692?
- Medium severity. CVSS v3 base score is 6.5 out of 10.