{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-56131 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-56131 is a medium-severity use after free vulnerability in Libexpat Project Libexpat, published on 19 Jun 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-2026-56131 and fix it if it is affected.\n\nWhat it is: CVE-2026-56131 is a medium-severity use after free vulnerability in Libexpat Project Libexpat, published on 19 Jun 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-2026-56131 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-2026-56131/ (Markdown: https://insights.sbomify.com/CVE-2026-56131/index.md)","id":"CVE-2026-56131","markdown":"https://insights.sbomify.com/CVE-2026-56131/index.md","name":"CVE-2026-56131","record":{"aliases":["ALPINE-CVE-2026-56131","AZL-90258","BELL-CVE-2026-56131","CLSA-2026-1786033457","CLSA-2026-1786109033","CLSA-2026-1786112354","CLSA-2026-1786112657","DEBIAN-CVE-2026-56131","ECHO-9a07-626d-d8ae","GHSA-fchf-wvcc-qf9g","JLSEC-2026-1225","ROOT-OS-DEBIAN-11-CVE-2026-56131","UBUNTU-CVE-2026-56131"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"XML parsing library","requires_auth":"none","summary":"A use-after-free vulnerability in libexpat allows attackers to execute arbitrary code or cause denial of service via crafted XML input.","user_interaction":"not_required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"libexpat","vendor":"libexpat_project"}],"cvss":{"score":4.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).","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":"Use after free in libexpat","id":"CVE-2026-56131","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"libexpat_project:libexpat","products":["libexpat_project:libexpat"],"type":"use_after_free","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"Memory corruption in libexpat","id":"CVE-2026-56132"},"packages":[],"prev":{"headline":"Apache Shiro: Remember-me cookie isn't checked for expiry on the server","id":"CVE-2026-56130"},"products":["libexpat"],"published":"2026-06-19","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":"partial"},"state":"PUBLISHED","updated":"2026-06-22","vendors":["libexpat project"]},"summary":"A use-after-free vulnerability in libexpat allows attackers to execute arbitrary code or cause denial of service via crafted XML input.","url":"https://insights.sbomify.com/CVE-2026-56131/"}