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CVE-2026-48755— Incus has an argument injection in backup compression algorithm leading to AFW and ACE

Quick assessment

Affected
lxc incus
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus 是一个系统容器和虚拟机管理器。在版本 7.1.0 之前，对用户提供的备份压缩算法的验证不当会导致在构造的命令行中发生参数注入。这可能导致在宿主机上任意文件写入，进而可能实现任意命令执行。版本 7.1.0 修复了此问题。

CVSS 9.9 · Critical EPSS 0.44% · P37

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.2.0 affected
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I. Basic Information for CVE-2026-48755

Vulnerability Information
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Vulnerability Title
Incus has an argument injection in backup compression algorithm leading to AFW and ACE
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Prior to version 7.1.0, improper validation of user-provided backup compression algorithm leads to argument injection in the constructed command line. This leads to an arbitrary file write on the host, possibly leading to arbitrary command execution. Version 7.1.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 7.2.0 -

II. Public POCs for CVE-2026-48755

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6614 chars
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III. Intelligence Information for CVE-2026-48755

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Vendor Advisories for CVE-2026-48755 (1)

Same Patch Batch · lxc · 2026-08-21 · 18 CVEs total

CVE-2026-62940 9.9 CRITICAL Incus has a project restriction bypass via instance migration config override
CVE-2026-63343 9.9 CRITICAL Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-63125 9.9 CRITICAL Incus vulnerable to root RCE via image backup.yaml symlink
CVE-2026-48769 9.9 CRITICAL Incus has an arbitrary file write on its client due to trusted image hash
CVE-2026-62867 9.9 CRITICAL Incus has an argument injection in storage volume block.create_options that leads to arbit
CVE-2026-62941 9.9 CRITICAL Incus: Cross-project instance copy bypasses target project restrictions via TOCTOU in conf
CVE-2026-48752 9.9 CRITICAL Incus has arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-48751 9.9 CRITICAL Incus has a restricted project bypass leading to arbitrary command execution
CVE-2026-48753 9.9 CRITICAL Incus has an arbitrary file write via path traversal in S3 multipart upload
CVE-2026-48749 9.9 CRITICAL Incus has an arbitrary file read+write on host via rootfs/ symlink in malicious image
CVE-2026-48750 9.9 CRITICAL Incus has an arbitrary file write on host via `exec-output` symlink in crafted image
CVE-2026-55621 7.7 HIGH Incus has a project restriction bypass for custom volume copy across projects
CVE-2026-55622 7.7 HIGH Incus has a project restriction bypass in instance copy across projects
CVE-2026-47753 4.4 MEDIUM Incus has a Nil-Pointer Dereference Panic via Instance Backup Import (volume omitted)
CVE-2026-62313 4.3 MEDIUM Incus: Project restriction `restricted.containers.privilege=isolated` bypassable by omitti
CVE-2026-48754 2.1 LOW Incus: Nil-pointer dereference in createDependentVolumesFromBackup on disk.{Volume,VolumeS
CVE-2026-48756 2.1 LOW Incus: CreateCustomVolumeFromBackup nil-pointer dereference on volume_snapshots[*].expires

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-20

V. Comments for CVE-2026-48755

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