{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-4437 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-4437 is a high-severity memory corruption vulnerability in Gnu Glibc, published on 20 Mar 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-2026-4437 and fix it if it is affected.\n\nWhat it is: CVE-2026-4437 is a high-severity memory corruption vulnerability in Gnu Glibc, published on 20 Mar 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-2026-4437 in the wild and no public exploit code.\n\nAffected product: Gnu Glibc. 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-2026-4437/ (Markdown: https://insights.sbomify.com/CVE-2026-4437/index.md)","id":"CVE-2026-4437","markdown":"https://insights.sbomify.com/CVE-2026-4437/index.md","name":"CVE-2026-4437","record":{"aliases":["AZL-80279","BELL-CVE-2026-4437","DEBIAN-CVE-2026-4437","ECHO-3c7d-5484-9e80","GHSA-m5wq-r4r4-4qrh","MINI-fq6p-vw6g-v37x","MINI-ggqv-3w5g-76qx","MINI-hq47-mvp4-hcgg","ROOT-OS-UBUNTU-2204-CVE-2026-4437","UBUNTU-CVE-2026-4437"],"analysis":{"component_type":"operating_system","fix_type":"upgrade","impacts":["code_execution","denial_of_service"],"network_reachable":"yes","non_default_config":true,"product_category":"GNU C Library","requires_auth":"none","summary":"A crafted DNS response can cause glibc to misinterpret non-answer sections, potentially leading to memory corruption and code execution in applications using specific nsswitch configurations.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"glibc","cpe":[{"product":"glibc","vendor":"gnu"}],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-125","name":"Out-of-bounds Read"}],"description":"Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C Library version 2.34 to version 2.43 could, with a crafted response from the configured DNS server, result in a violation of the DNS specification that causes the application to treat a non-answer section of the DNS response as a valid answer.","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":"gethostbyaddr and gethostbyaddr_r may incorrectly handle DNS response","id":"CVE-2026-4437","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"gnu:glibc","products":["gnu:glibc"],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":1,"next":{"headline":"gethostbyaddr and gethostbyaddr_r return invalid DNS hostnames","id":"CVE-2026-4438"},"packages":[],"prev":{"headline":"GPL Odorizers GPL750 Missing Authentication for Critical Function","id":"CVE-2026-4436"},"products":["glibc"],"published":"2026-03-20","related":[{"cvss_score":9.8,"headline":"scanf %mc off-by-one heap buffer overflow","id":"CVE-2026-5450","kev_date_added":null,"published":"2026-04-20"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2023-25139","kev_date_added":null,"published":"2023-02-03"},{"cvss_score":9.8,"headline":"Other in n/a","id":"CVE-1999-0199","kev_date_added":null,"published":"2020-10-06"},{"cvss_score":9.8,"headline":"Security feature bypass in glibc","id":"CVE-2019-1010022","kev_date_added":null,"published":"2019-07-15"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2005-3590","kev_date_added":null,"published":"2019-04-10"},{"cvss_score":9.8,"headline":"Memory corruption in n/a","id":"CVE-2017-18269","kev_date_added":null,"published":"2018-05-18"},{"cvss_score":9.8,"headline":"Integer overflow in n/a","id":"CVE-2018-11236","kev_date_added":null,"published":"2018-05-18"}],"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":"2026-10-15","vendors":["The GNU C Library"]},"summary":"A crafted DNS response can cause glibc to misinterpret non-answer sections, potentially leading to memory corruption and code execution in applications using specific nsswitch configurations.","url":"https://insights.sbomify.com/CVE-2026-4437/"}