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CVE-2026-40243— Incus OVN TLS verification accepts peer-supplied roots and permits endpoint impersonation

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之前版本存在信任管理问题漏洞，该漏洞源于OVN数据库连接逻辑中TLS验证逻辑损坏，可能导致攻击者通过提供伪造的自签名证书链绕过基于CA的信任模型，实现端点冒充。

AI Predicted 7.4 Difficulty: Moderate EPSS 0.22% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
lxc incus < 7.0.0 affected
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I. Basic Information for CVE-2026-40243

Vulnerability Information
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Vulnerability Title
Incus OVN TLS verification accepts peer-supplied roots and permits endpoint impersonation
Source: CVE Program / CVE List V5
Vulnerability Description
Incus is a system container and virtual machine manager. In versions before 7.0.0, broken TLS validation logic in the OVN database connection logic can allow connections to an attacker's OVN database. The OVN client implementations disable Go standard TLS server verification and replace it with custom peer-certificate verification logic. That replacement verifier does not anchor trust in the configured CA certificate. Instead, it constructs the verification root set from certificates supplied by the peer during the handshake, so the configured CA is parsed but not used as the trust anchor for the final verification decision. In OVN-enabled deployments that use these SSL database connection paths, an attacker able to impersonate or intercept the OVN endpoint on the management network can present a rogue self-signed certificate chain, and Incus will accept this certificate as valid. This issue defeats the intended CA-based trust model for OVN database connections and permits endpoint impersonation by an active attacker in a suitable network position. This issue is fixed in version 7.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Incus 信任管理问题漏洞
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之前版本存在信任管理问题漏洞，该漏洞源于OVN数据库连接逻辑中TLS验证逻辑损坏，可能导致攻击者通过提供伪造的自签名证书链绕过基于CA的信任模型，实现端点冒充。
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-2026-40243

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III. Intelligence Information for CVE-2026-40243

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Patches & Fixes for CVE-2026-40243 (3)

Vendor Advisories for CVE-2026-40243 (1)

Same Patch Batch · lxc · 2026-05-06 · 4 CVEs total

CVE-2026-40251 Incus out-of-bounds panic in snapshot metadata handling allows denial of service
CVE-2026-40197 Incus nil-pointer dereference in custom volume import allows denial of service
CVE-2026-40195 Incus nil-pointer dereference in storage bucket import allows denial of service

IV. Related Vulnerabilities

Same product: incus
Same vendor: lxc
Same weakness: CWE-295

V. Comments for CVE-2026-40243

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