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CVE-2026-35527 medium CVSS 5.0

SSRF (Server-Side Request Forgery) in github.com/lxc/incus/v6/cmd/incusd (CVE-2026-35527)

Summary

SSRF in github.com/lxc/incus/v6/cmd/incusd (CVE-2026-35527). Risk of unauthorized operations or information disclosure. Exploitable via restricted.images.servers. Mitigation: upgrade to 7.0.0 or later.

Original description

The description as published by the source.

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: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-35527 has been found in github.com/lxc/incus/v6/cmd/incusd.
Attackers can target a specific entry point like restricted.images.servers over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.0/10.
What to do: upgrade github.com/lxc/incus/v6/cmd/incusd to 7.0.0 or later.
If unsure, ask your IT team or search "github.com/lxc/incus/v6/cmd/incusd CVE-2026-35527" on the vendor's site.

CVE-2026-35527 (github.com/lxc/incus/v6/cmd/incusd) — CWE-918 / CVSS v3 5.0
Attack vector: remote (network-reachable) / no user interaction
Attack surface: restricted.images.servers
Patched: 7.0.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

SSRF (CWE-918) exists in github.com/lxc/incus/v6/cmd/incusd. Attackers reach the vulnerable code path via restricted.images.servers.

📍 Affected scope

Check the vendor advisory for the affected versions of github.com/lxc/incus/v6/cmd/incusd. Attack surface: restricted.images.servers.

🔥 Severity

Severity: Medium (CVSS 5.0/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 7.0.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'github.com/lxc/incus/v6/cmd/incusd' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'github.com/lxc/incus/v6/cmd/incusd' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で github.com/lxc/incus/v6/cmd/incusd を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade github.com/lxc/incus/v6/cmd/incusd to 7.0.0

    ステージング環境で 7.0.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

go github.com/lxc/incus/v6/cmd/incusd
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.0.0"}]}]
Go github.com/lxc/incus
[{"type":"SEMVER","events":[{"introduced":"0"}]}]
Go github.com/lxc/incus/v6
[{"type":"SEMVER","events":[{"introduced":"0"}]}]
Go github.com/lxc/incus/v7
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.0.0"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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