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CVE-2026-41684— Incus: Nil Dereferences on Restore via Malformed YAML

Quick assessment

Affected
lxc incus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 7.0.0之前版本存在代码问题漏洞，该漏洞源于backup.GetInfo信任内联备份配置，允许携带有效内联配置和格式错误的遗留备份文件，可能导致经过身份验证的用户通过特制备份存档导致Incus守护进程崩溃。

CVSS 6.5 · Medium EPSS 0.47% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.0.0 affected
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I. Basic Information for CVE-2026-41684

Vulnerability Information
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Vulnerability Title
Incus: Nil Dereferences on Restore via Malformed YAML
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. Prior to version 7.0.0, backup.GetInfo() trusts the inline backup/index.yaml config when present and only falls back to parsing the legacy backup/container/backup.yaml file if result.Config == nil. As a result, an archive can carry a valid inline config that passes the initial import preflight while also carrying a malformed legacy backup/container/backup.yaml file that is reparsed later from the restored file system. ParseConfigYamlFile() accepts YAML documents with no container section, and multiple downstream consumers then dereference. Container without checking for nil. Confirmed examples in the instance restore and import flow include backup.UpdateInstanceConfig() and internalImportFromBackup(). An authenticated user with permission to import instance backups may be able to crash the Incus daemon with a crafted backup archive whose inline backup/index.yaml is valid but whose extracted legacy backup.yaml omits container. The crash occurs in the restore path after archive extraction has begun. This issue has been patched in version 7.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Incus是LXC开源的一个系统容器和虚拟机管理器。 Incus 7.0.0之前版本存在代码问题漏洞，该漏洞源于backup.GetInfo信任内联备份配置，允许携带有效内联配置和格式错误的遗留备份文件，可能导致经过身份验证的用户通过特制备份存档导致Incus守护进程崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxc incus < 7.0.0 -

II. Public POCs for CVE-2026-41684

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III. Intelligence Information for CVE-2026-41684

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Vendor Advisories for CVE-2026-41684 (1)

Vendor Pages for CVE-2026-41684 (1)

Same Patch Batch · lxc · 2026-05-07 · 4 CVEs total

CVE-2026-41647 6.5 MEDIUM Incus: Nil-Pointer Dereference via S3 Bucket Import
CVE-2026-41685 4.3 MEDIUM Incus: Unbounded binary import disk exhaustion
CVE-2026-41648 Incus: Unbounded YAML Metadata Decode via Parsing

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-476

V. Comments for CVE-2026-41684

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