{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18739 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-18739 is a low-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 4 Aug 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-2026-18739 and fix it if it is affected.\n\nWhat it is: CVE-2026-18739 is a low-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 4 Aug 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-2026-18739 in the wild and no public exploit code.\n\nAffected product: Red Hat Enterprise Linux 10. 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-2026-18739/ (Markdown: https://insights.sbomify.com/CVE-2026-18739/index.md)","id":"CVE-2026-18739","markdown":"https://insights.sbomify.com/CVE-2026-18739/index.md","name":"CVE-2026-18739","record":{"aliases":["AZL-94508","AZL-94596","BELL-CVE-2026-18739","DEBIAN-CVE-2026-18739","ECHO-784f-603d-c633","GHSA-255r-gqmx-m2jm","OESA-2026-3611","OESA-2026-3612","OESA-2026-3613","OESA-2026-3614","UBUNTU-CVE-2026-18739"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"popt command-line parsing library","requires_auth":"low_privilege","summary":"A local attacker can exploit an off-by-one error in the popt library to corrupt memory and potentially execute arbitrary code.","user_interaction":"not_required","vuln_class":"memory_corruption"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":2.5,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"}],"description":"A flaw was found in popt, a command-line option parsing library. An off-by-one error in the poptStuffArgs function, when repeatedly called by a host application or through deep alias nesting, can lead to corruption of internal program data. This corruption could potentially enable a local attacker to execute arbitrary code if the host application then unsafely processes the altered data.","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":"Popt-devel: popt-static: off-by-one in poptstuffargs","id":"CVE-2026-18739","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"memory_corruption","year":"2026"},"n_packages":0,"n_references":3,"next":{"headline":"Security vulnerabilities have been found in IBM Verify Identity Access and IBM Security Verify Access","id":"CVE-2026-18740"},"packages":[],"prev":{"headline":"Shlink CSV Formula Injection via Visit Export CLI","id":"CVE-2026-18738"},"products":["Red Hat Enterprise Linux 10","Red Hat Enterprise Linux 6","Red Hat Enterprise Linux 7","Red Hat Enterprise Linux 8","Red Hat Enterprise Linux 9","Red Hat Hardened Images","Red Hat OpenShift Container Platform 4","popt"],"published":"2026-08-04","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-08-31","vendors":["Red Hat","rpm-software-management"]},"summary":"A local attacker can exploit an off-by-one error in the popt library to corrupt memory and potentially execute arbitrary code.","url":"https://insights.sbomify.com/CVE-2026-18739/"}