{"answers":{"affected":"4 open source packages ship an affected version, including github.com/lxc/incus/v6 and github.com/lxc/incus. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23953 exists.","fix":"Upgrade github.com/lxc/incus/v6 to 6.21.0 or later.","what":"CVE-2026-23953 is a high-severity code injection vulnerability in lxc incus, published on 22 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-23953 and fix it if it is affected.\n\nWhat it is: CVE-2026-23953 is a high-severity code injection vulnerability in lxc incus, published on 22 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23953 exists.\n\nAffected packages and fixed versions:\n- github.com/lxc/incus/v6 (Go): affected all versions; fixed in 6.21.0\n- github.com/lxc/incus/v6 (Go): affected all versions; fixed in 6.21.0\n- github.com/lxc/incus/v6 (Go): affected from 6.1.0; no fix listed\n- github.com/lxc/incus (Go): affected all versions; no fix listed\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-23953/ (Markdown: https://insights.sbomify.com/CVE-2026-23953/index.md)","id":"CVE-2026-23953","markdown":"https://insights.sbomify.com/CVE-2026-23953/index.md","name":"CVE-2026-23953","record":{"aliases":["DEBIAN-CVE-2026-23953","GHSA-x6jc-phwx-hp32","GO-2026-4359","UBUNTU-CVE-2026-23953"],"analysis":{"component_type":"container_or_infrastructure","fix_type":"upgrade","impacts":["code_execution","privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Incus container manager","requires_auth":"low_privilege","summary":"A user with container launch privileges can inject newlines into environment variables to execute arbitrary commands on the host via lifecycle hooks.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"incus","vendor":"linuxcontainers"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-93","name":"Improper Neutralization of CRLF Sequences"}],"description":"Incus is a system container and virtual machine manager. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the ‘incus’ group) can create an environment variable containing newlines, which can be used to add additional configuration items in the container’s lxc.conf due to newline injection. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. Exploiting this issue on IncusOS requires a slight modification of the payload to change to a different writable directory for the validation step (e.g /tmp). This can be confirmed with a second container with /tmp mounted from the host (A privileged action for validation only). A fix is planned for versions 6.0.6\nand 6.21.0, but they have not been released at the time of publication.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Incus container environment configuration newline injection","id":"CVE-2026-23953","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"code_injection","year":"2026"},"n_packages":4,"n_references":4,"next":{"headline":"Incus container image templating arbitrary host file read and write","id":"CVE-2026-23954"},"packages":[{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus","purl":"pkg:golang/github.com/lxc/incus","source":"GO-2026-4359"},{"ecosystem":"Go","fixed":["6.21.0"],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v6","purl":null,"source":"GHSA-x6jc-phwx-hp32"},{"ecosystem":"Go","fixed":["6.21.0"],"introduced":["0"],"last_affected":[],"package":"github.com/lxc/incus/v6","purl":"pkg:golang/github.com/lxc/incus/v6","source":"GHSA-x6jc-phwx-hp32"},{"ecosystem":"Go","fixed":[],"introduced":["6.1.0"],"last_affected":[],"package":"github.com/lxc/incus/v6","purl":"pkg:golang/github.com/lxc/incus/v6","source":"GO-2026-4359"}],"prev":{"headline":"ImageMagick has a NULL pointer dereference in MSL parser via \u003ccomment\u003e tag before image load","id":"CVE-2026-23952"},"products":["incus"],"published":"2026-01-22","related":[{"cvss_score":10,"headline":"Incus vulnerable to arbitrary file read and write through pongo templates","id":"CVE-2026-33897","kev_date_added":null,"published":"2026-03-26"},{"cvss_score":10,"headline":"Abitrary file write through systemd-creds option","id":"CVE-2026-33945","kev_date_added":null,"published":"2026-03-26"},{"cvss_score":8.8,"headline":"Local Incus UI web server vulnerable to nuthentication bypass","id":"CVE-2026-33898","kev_date_added":null,"published":"2026-03-26"},{"cvss_score":8.7,"headline":"Incus container image templating arbitrary host file read and write","id":"CVE-2026-23954","kev_date_added":null,"published":"2026-01-22"},{"cvss_score":8.6,"headline":"Incus vulnerable to local privilege escalation through custom storage volumes","id":"CVE-2025-64507","kev_date_added":null,"published":"2025-11-10"},{"cvss_score":7.1,"headline":"Incus nil-pointer dereference in storage bucket import allows denial of service","id":"CVE-2026-40195","kev_date_added":null,"published":"2026-05-06"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-01-26","vendors":["lxc"]},"summary":"A user with container launch privileges can inject newlines into environment variables to execute arbitrary commands on the host via lifecycle hooks.","url":"https://insights.sbomify.com/CVE-2026-23953/"}