{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-23556 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-23556 is a critical denial of service vulnerability in oxenstored, published on 9 Jul 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-2026-23556 and fix it if it is affected.\n\nWhat it is: CVE-2026-23556 is a critical denial of service vulnerability in oxenstored, published on 9 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-23556 in the wild and no public exploit code.\n\nAffected product: oxenstored. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-23556/ (Markdown: https://insights.sbomify.com/CVE-2026-23556/index.md)","id":"CVE-2026-23556","markdown":"https://insights.sbomify.com/CVE-2026-23556/index.md","name":"CVE-2026-23556","record":{"aliases":["DEBIAN-CVE-2026-23556","GHSA-qcp2-2xf6-hw26","UBUNTU-CVE-2026-23556"],"analysis":{"component_type":"operating_system","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Xen hypervisor","requires_auth":"none","summary":"A flaw in Xen's oxenstored leaks quota usage counts, allowing a new domain to exhaust its quota prematurely and causing denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"XEN","cpe":[],"cvss":{"score":9.4,"severity":"critical","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","version":"4.0"},"cwes":[{"id":"CWE-281","name":"Improper Preservation of Permissions"}],"description":"When oxenstored is tearing a domain down, the node data is cleaned up\nbut the usage counts are leaked.\n\nWhen the domain ID is eventually reused, the new domain can create fewer\nnodes before beeing deemed to be over quota.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"oxenstored keeps quota related use counts across domain destruction","id":"CVE-2026-23556","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Xenstored DoS via XS_RESET_WATCHES command","id":"CVE-2026-23557"},"packages":[],"prev":{"headline":"Xenstored DoS by unprivileged domain","id":"CVE-2026-23555"},"products":["oxenstored"],"published":"2026-07-09","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-07-09","vendors":["Xen"]},"summary":"A flaw in Xen's oxenstored leaks quota usage counts, allowing a new domain to exhaust its quota prematurely and causing denial of service.","url":"https://insights.sbomify.com/CVE-2026-23556/"}