Live › vulnerability › CVE-2026-100355
Campfire fetches links posted in chat to build preview cards, and its guard against internal addresses misses CGNAT, NAT64 and 6to4 ranges. An authenticated user can make the server request internal resources and see OpenGraph metadata returned from them.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-30 14:30 UTC. All times on this page are UTC.
Teams that self-host Campfire version 1.4.4 or earlier and let logged-in users post links that the server unfurls. Exposure depends on the server being able to reach internal networks, and the sources say most internal endpoints return no data. Deployments on 1.4.5 or later are not affected by this report.
No product ranges from the sources yet.
1.4.4 or earlier1.4.5 (the sources say an initial fix was released in this version; later fixes are unknown)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Campfire is a web-based chat application. In version 1.4.4 and earlier, when a Campfire message contains a link, the server fetches it to build an OpenGraph unfurl preview. RestrictedHTTP::PrivateNetworkGuard relied on Ruby's IPAddr#private? `` IPAddr#loopback?, and IPAddr#link_local? predicates plus IPv4-mapped and IPv4-compatible checks, which do not cover several special-use ranges. An authenticated user can post a link to a hostname resolving to CGNAT 100.64.0.0/10, NAT64 64:ff9b::/96 or 64:ff9b:1::/48, or 6to4 2002::/16 to bypass the guard and cause server-side requests to internal network resources. The NAT64 and 6to4 ranges can embed an internal IPv4 target. Confidentiality impact is limited to returned OpenGraph metadata, and most internal endpoints return none. There is no integrity or availability impact. An initial fix was released in version 1.4.5.
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