{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-56409 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-56409 is a medium-severity vulnerability in Libexpat Project Libexpat, published on 21 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-56409 and fix it if it is affected.\n\nWhat it is: CVE-2026-56409 is a medium-severity vulnerability in Libexpat Project Libexpat, published on 21 Jun 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-56409 in the wild and no public exploit code.\n\nAffected product: Libexpat Project Libexpat. 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-2026-56409/ (Markdown: https://insights.sbomify.com/CVE-2026-56409/index.md)","id":"CVE-2026-56409","markdown":"https://insights.sbomify.com/CVE-2026-56409/index.md","name":"CVE-2026-56409","record":{"aliases":["ALPINE-CVE-2026-56409","AZL-90249","BELL-CVE-2026-56409","DEBIAN-CVE-2026-56409","ECHO-e231-2b20-a715","GHSA-jhv6-83wh-9vj5","JLSEC-2026-1233","ROOT-OS-DEBIAN-11-CVE-2026-56409","UBUNTU-CVE-2026-56409"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":true,"product_category":"XML parsing library","requires_auth":"none","summary":"An integer overflow in libexpat's xmlwf tool can cause denial of service when processing output filenames with a specified directory.","user_interaction":"required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"libexpat","vendor":"libexpat_project"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L","version":"3.1"},"cwes":[{"id":"CWE-190","name":"Integer Overflow or Wraparound"}],"description":"xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.","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":"Integer overflow in libexpat","id":"CVE-2026-56409","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"libexpat_project:libexpat","products":["libexpat_project:libexpat"],"type":"integer_overflow","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Integer overflow in libexpat","id":"CVE-2026-56410"},"packages":[],"prev":{"headline":"Integer overflow in libexpat","id":"CVE-2026-56408"},"products":["libexpat"],"published":"2026-06-21","related":[{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2024-45490","kev_date_added":null,"published":"2024-08-30"},{"cvss_score":8.7,"headline":"Expat Denial of Service via storeAtts() Quadratic Complexity","id":"CVE-2026-66046","kev_date_added":null,"published":"2026-08-18"},{"cvss_score":8.1,"headline":"Integer overflow in n/a","id":"CVE-2021-46143","kev_date_added":null,"published":"2022-01-06"},{"cvss_score":7.8,"headline":"Privilege escalation in n/a","id":"CVE-2017-11742","kev_date_added":null,"published":"2017-07-30"},{"cvss_score":7.5,"headline":"Denial of service in libexpat","id":"CVE-2025-59375","kev_date_added":null,"published":"2025-09-15"},{"cvss_score":7.5,"headline":"Denial of service in n/a","id":"CVE-2023-52425","kev_date_added":null,"published":"2024-02-04"},{"cvss_score":7.3,"headline":"Integer overflow in n/a","id":"CVE-2024-45491","kev_date_added":null,"published":"2024-08-30"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-06-22","vendors":["libexpat project"]},"summary":"An integer overflow in libexpat's xmlwf tool can cause denial of service when processing output filenames with a specified directory.","url":"https://insights.sbomify.com/CVE-2026-56409/"}