{"answers":{"affected":"2 open source packages ship an affected version, including nokogiri. It affects 18 products.","exploited":"There is no known exploitation of CVE-2021-3518 in the wild and no public exploit code.","fix":"Upgrade nokogiri to 1.11.4 or later.","what":"CVE-2021-3518 is a high-severity use after free vulnerability in Debian Debian Linux, published on 18 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2021-3518 and fix it if it is affected.\n\nWhat it is: CVE-2021-3518 is a high-severity use after free vulnerability in Debian Debian Linux, published on 18 May 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2021-3518 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- nokogiri (RubyGems): affected all versions; fixed in 1.11.4\n- nokogiri (RubyGems): affected all versions; fixed in 1.11.4\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-2021-3518/ (Markdown: https://insights.sbomify.com/CVE-2021-3518/index.md)","id":"CVE-2021-3518","markdown":"https://insights.sbomify.com/CVE-2021-3518/index.md","name":"CVE-2021-3518","record":{"aliases":["ALPINE-CVE-2021-3518","DEBIAN-CVE-2021-3518","ECHO-cbc1-7e66-bf2c","GHSA-v4f8-2847-rwm7","JLSEC-2025-71","UBUNTU-CVE-2021-3518"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"XML parsing library","requires_auth":"none","summary":"An attacker can trigger a use-after-free in libxml2 via a crafted file, potentially leading to code execution or denial of service.","user_interaction":"required","vuln_class":"use_after_free"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"active_iq_unified_manager","vendor":"netapp"},{"product":"clustered_data_ontap","vendor":"netapp"},{"product":"clustered_data_ontap_antivirus_connector","vendor":"netapp"},{"product":"hci_h410c_firmware","vendor":"netapp"},{"product":"manageability_software_development_kit","vendor":"netapp"},{"product":"ontap_select_deploy_administration_utility","vendor":"netapp"},{"product":"snapdrive","vendor":"netapp"},{"product":"communications_cloud_native_core_network_function_cloud_native_environment","vendor":"oracle"},{"product":"enterprise_manager_base_platform","vendor":"oracle"},{"product":"enterprise_manager_ops_center","vendor":"oracle"},{"product":"mysql_workbench","vendor":"oracle"},{"product":"peoplesoft_enterprise_peopletools","vendor":"oracle"},{"product":"real_user_experience_insight","vendor":"oracle"},{"product":"enterprise_linux","vendor":"redhat"},{"product":"jboss_core_services","vendor":"redhat"},{"product":"libxml2","vendor":"xmlsoft"}],"cvss":{"score":8.8,"severity":"high","source":"nvd","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[{"id":"CWE-416","name":"Use After Free"}],"description":"There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, and availability.","ecosystems":["RubyGems"],"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":"Nokogiri Implements libxml2 version vulnerable to use-after-free","id":"CVE-2021-3518","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora","netapp:active_iq_unified_manager","netapp:clustered_data_ontap","netapp:ontap_select_deploy_administration_utility","oracle:enterprise_manager_base_platform","oracle:enterprise_manager_ops_center","oracle:peoplesoft_enterprise_peopletools","redhat:enterprise_linux","xmlsoft:libxml2"],"type":"use_after_free","year":"2021"},"n_packages":2,"n_references":19,"next":{"headline":"Auth bypass in Desktop BIOS","id":"CVE-2021-3519"},"packages":[{"ecosystem":"RubyGems","fixed":["1.11.4"],"introduced":["0"],"last_affected":[],"package":"nokogiri","purl":null,"source":"GHSA-v4f8-2847-rwm7"},{"ecosystem":"RubyGems","fixed":["1.11.4"],"introduced":["0"],"last_affected":[],"package":"nokogiri","purl":"pkg:gem/nokogiri","source":"GHSA-v4f8-2847-rwm7"}],"prev":{"headline":"Nokogiri contains libxml Out-of-bounds Write vulnerability","id":"CVE-2021-3517"},"products":["libxml2"],"published":"2021-05-18","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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":"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-14","vendors":["n/a"]},"summary":"An attacker can trigger a use-after-free in libxml2 via a crafted file, potentially leading to code execution or denial of service.","url":"https://insights.sbomify.com/CVE-2021-3518/"}