Bug 2521003 (CVE-2026-48750)

Summary: CVE-2026-48750 incus: Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: urgent    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Incus, a container and virtual machine manager. A crafted container image can cause the host to write files to arbitrary locations via a symlink, potentially leading to command execution as root on the host.
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Bug Depends On: 2524268    
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Description OSIDB Bzimport 2026-08-21 14:48:33 UTC 
Incus is a system container and virtual machine manager. Prior to version 7.2.0, the `record-output` parameter of the `/instances/$name/exec` endpoint stores the output of the command in the `exec-output` directory of the instance. If `exec-output` is a symlink, file named `exec_UUID.stdout` and `exec_UUID.stderr` can be written to an arbitrary location where the `.stdout` file will contain arbitrary content. This behavior can be abused for arbitrary command execution. Version 7.2.0 contains a patch.