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CVE-2026-9639— Authenticated Denial of Service via Malicious Backup Tarball in LXD

CVSS 6.5 · Medium EPSS 0.39% · P31

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
CanonicalLXD5.21.0< 5.21.5affected
6.0< 6.9affected
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I. Basic Information for CVE-2026-9639

Vulnerability Information
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Vulnerability Title
Authenticated Denial of Service via Malicious Backup Tarball in LXD
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nil-pointer dereference in CreateCustomVolumeFromBackup in LXD up to version 6.8 and 5.21 on Linux allows an authenticated user with can_create_storage_volumes permissions to cause a denial of service via a specially crafted custom-volume backup tarball that omits the expires_at snapshot field.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
空指针解引用
Source: NVD (National Vulnerability Database)
Vulnerability Title
Canonical LXD 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD存在异常处理不当漏洞，该漏洞源于在CreateCustomVolumeFromBackup中存在空指针取消引用问题，可能导致具有can_create_storage_volumes权限的已认证用户通过特制的自定义卷备份tarball（省略expires_at快照字段）造成拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
CanonicalLXD 5.21.0 ~ 5.21.5 -

II. Public POCs for CVE-2026-9639

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III. Intelligence Information for CVE-2026-9639

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Patches & Fixes for CVE-2026-9639 (2)

Vendor Advisories for CVE-2026-9639 (1)

Same Patch Batch · Canonical · 2026-06-26 · 4 CVEs total

CVE-2026-124118.4 HIGHBroken Access Control in Canonical LXD DevLXD API
CVE-2026-96407.2 HIGHLXD Snapshot Import Privilege Escalation Vulnerability
CVE-2026-283855.0 MEDIUMSSRF via image import from URL allows internal network probing by authenticated users

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-476

V. Comments for CVE-2026-9639

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