{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-76956 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-76956 is a medium-severity denial of service vulnerability in Libexpat Project Libexpat, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-76956 and fix it if it is affected.\n\nWhat it is: CVE-2026-76956 is a medium-severity denial of service vulnerability in Libexpat Project Libexpat, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-76956 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-2026-76956/ (Markdown: https://insights.sbomify.com/CVE-2026-76956/index.md)","id":"CVE-2026-76956","markdown":"https://insights.sbomify.com/CVE-2026-76956/index.md","name":"CVE-2026-76956","record":{"aliases":["ALPINE-CVE-2026-76956","AZL-96848","BELL-CVE-2026-76956","DEBIAN-CVE-2026-76956","ECHO-8a36-8d53-bf0c","GHSA-x282-q22w-c9hm","UBUNTU-CVE-2026-76956"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"XML parsing library","requires_auth":"none","summary":"Attackers can cause denial of service via crafted XML content due to insufficient entropy from misinterpreted getentropy return codes in libexpat.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"libexpat","vendor":"libexpat_project"}],"cvss":{"score":5.9,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-394","name":"Unexpected Status Code or Return Value"}],"description":"In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.","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":"Denial of service in libexpat","id":"CVE-2026-76956","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"libexpat_project:libexpat","products":["libexpat_project:libexpat"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Use after free in libexpat","id":"CVE-2026-76957"},"packages":[],"prev":{"headline":"Remember-me sign-in guard reads a session key that is never written in ash_authentication, allowing session replacement","id":"CVE-2026-76949"},"products":["libexpat"],"published":"2026-08-20","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":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-20","vendors":["libexpat project"]},"summary":"Attackers can cause denial of service via crafted XML content due to insufficient entropy from misinterpreted getentropy return codes in libexpat.","url":"https://insights.sbomify.com/CVE-2026-76956/"}