CVE-2026-85692 Nightingale 9.1.1 SSRF Guard Bypass via IPv6 Encoding
Attackers can bypass SSRF guards in Nightingale's AI-agent tool by using specific IPv6 encodings to access internal services or cloud metadata.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-85692?
CVE-2026-85692 is a high-severity server-side request forgery vulnerability in ccfos nightingale, published on 4 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-85692?
How do I fix CVE-2026-85692?
No fix has been published for CVE-2026-85692 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-85692 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-85692 exists.
Sources
Also known as GHSA-wc5f-hgwx-ffx9.