Bug 2466904 (CVE-2026-35527)

Summary: CVE-2026-35527 github.com/lxc/incus: Incus: Server-Side Request Forgery (SSRF) allows information disclosure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Incus, an open-source container and virtual machine manager. An authenticated user can exploit this vulnerability by supplying a malicious URL during the image import process. Before project restrictions are applied, Incus makes a blind HEAD request to the user-supplied URL, including server metadata in custom headers. This Server-Side Request Forgery (SSRF) allows an attacker to disclose information about the host environment and probe internal services or cloud metadata endpoints.
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Bug Depends On: 2476735    
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Description OSIDB Bzimport 2026-05-05 21:01:24 UTC 
Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations.

These requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host.

This vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0.