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CVE-2026-34179— Update of type field in restricted TLS certificate allows privilege escalation to cluster admin

Quick assessment

Affected
Canonical lxd
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.

LXD是Canonical开源的一款基于Linux系统用于管理应用程序的容器。 LXD 4.12至6.7版本存在安全漏洞，该漏洞源于处理受限TLS证书用户的PUT/PATCH请求时，doCertificateUpdate函数未验证Type字段，可能导致远程经过身份验证的攻击者将权限提升至集群管理员。

CVSS 9.1 · Critical EPSS 0.42% · P34

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts
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I. Basic Information for CVE-2026-34179

Vulnerability Information
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Vulnerability Title
Update of type field in restricted TLS certificate allows privilege escalation to cluster admin
Source: CVE Program / CVE List V5
Vulnerability Description
In Canonical LXD versions 4.12 through 6.7, the doCertificateUpdate function in lxd/certificates.go does not validate the Type field when handling PUT/PATCH requests to /1.0/certificates/{fingerprint} for restricted TLS certificate users, allowing a remote authenticated attacker to escalate privileges to cluster admin.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-915
Source: CVE Program / CVE List V5
Vulnerability Title
LXD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LXD是Canonical开源的一款基于Linux系统用于管理应用程序的容器。 LXD 4.12至6.7版本存在安全漏洞，该漏洞源于处理受限TLS证书用户的PUT/PATCH请求时，doCertificateUpdate函数未验证Type字段，可能导致远程经过身份验证的攻击者将权限提升至集群管理员。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical lxd 4.12.0 ~ 5.0.7 -

II. Public POCs for CVE-2026-34179

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Qwen3.6-35B-A3B · 14100 chars
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III. Intelligence Information for CVE-2026-34179

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Vendor Advisories for CVE-2026-34179 (1)

Same Patch Batch · Canonical · 2026-04-09 · 5 CVEs total

CVE-2026-34178 9.1 CRITICAL Importing a crafted backup leads to project restriction bypass
CVE-2026-34177 9.1 CRITICAL VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf
CVE-2025-15480 Senstive information disclosure was affecting ubuntu-desktop-provision
CVE-2025-14551 Senstive information disclosure was affecting subiquity

IV. Related Vulnerabilities

Same product: lxd
Same vendor: Canonical
Same weakness: CWE-915

V. Comments for CVE-2026-34179

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