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CVE-2026-35527— Incus blind SSRF via image import preflight HEAD request

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，该漏洞源于镜像导入流程在验证项目限制之前向用户提供的URL发出出站HEAD请求，可能导致经过身份验证的用户强制守护进程向任意目的地发送盲SSRF请求，并泄露服务器元数据。

AI Predicted 8.1 Difficulty: Easy EPSS 0.29% · P20

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.0.0 affected
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I. Basic Information for CVE-2026-35527

Vulnerability Information
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Vulnerability Title
Incus blind SSRF via image import preflight HEAD request
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is an open source container and virtual machine manager. In versions prior to 7.0.0, the image import flow issues an outbound HEAD request to a user-supplied URL before validating the request against project restrictions such as restricted.images.servers. The imgPostURLInfo function constructs and sends a HEAD request directly from the attacker-supplied source URL to resolve image metadata, and this network interaction occurs before the flow reaches the point where the import would be rejected by policy. Although the actual image download is blocked by the project restriction, an authenticated user can coerce the daemon into making blind HEAD requests to arbitrary destinations. These requests include server metadata in custom headers (Incus-Server-Architectures, Incus-Server-Version), which discloses information about the host environment to the attacker-controlled endpoint. This blind SSRF primitive can be used to probe internal services, unroutable address space, or cloud metadata endpoints reachable from the host. This vulnerability pattern is similar to CVE-2026-24767. This issue has been fixed in version 7.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
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，该漏洞源于镜像导入流程在验证项目限制之前向用户提供的URL发出出站HEAD请求，可能导致经过身份验证的用户强制守护进程向任意目的地发送盲SSRF请求，并泄露服务器元数据。
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-2026-35527

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III. Intelligence Information for CVE-2026-35527

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Vendor Advisories for CVE-2026-35527 (1)

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-918

V. Comments for CVE-2026-35527

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