{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-18839 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-18839 is a low-severity vulnerability in Red Hat Enterprise Linux 10, published on 5 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-18839 and fix it if it is affected.\n\nWhat it is: CVE-2026-18839 is a low-severity vulnerability in Red Hat Enterprise Linux 10, published on 5 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-18839 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-2026-18839/ (Markdown: https://insights.sbomify.com/CVE-2026-18839/index.md)","id":"CVE-2026-18839","markdown":"https://insights.sbomify.com/CVE-2026-18839/index.md","name":"CVE-2026-18839","record":{"aliases":["AZL-94511","AZL-94668","DEBIAN-CVE-2026-18839","ECHO-3ba8-d639-d262","GHSA-8fjx-p4xg-vgp8","OESA-2026-4392","OESA-2026-4393","OESA-2026-4394","OESA-2026-4395","RHSA-2026:77932","UBUNTU-CVE-2026-18839"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["denial_of_service"],"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 cause a denial of service in applications using the popt library by triggering an integer underflow during help text formatting.","user_interaction":"required","vuln_class":"integer_overflow"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"redhat","cpe":[],"cvss":{"score":2.2,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-191","name":"Integer Underflow (Wrap or Wraparound)"}],"description":"An integer underflow was found in the popt library when formatting help text for option tables that exceed the terminal width. A local user who can cause an application to print help under those conditions may cause that application to crash or fail to display help, resulting in a denial of service of the affected application.","ecosystems":["Red Hat:hummingbird:1"],"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: size_t underflow in singleoptionhelp","id":"CVE-2026-18839","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"integer_overflow","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Vulnerabilities in IBM AIX and PowerVM VIOS","id":"CVE-2026-18840"},"packages":[{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.19-11.2.hum1"],"introduced":["0"],"last_affected":[],"package":"popt","purl":"pkg:rpm/redhat/popt","source":"RHSA-2026:77932"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.19-11.2.hum1"],"introduced":["0"],"last_affected":[],"package":"popt-devel","purl":"pkg:rpm/redhat/popt-devel","source":"RHSA-2026:77932"},{"ecosystem":"Red Hat:hummingbird:1","fixed":["0:1.19-11.2.hum1"],"introduced":["0"],"last_affected":[],"package":"popt-static","purl":"pkg:rpm/redhat/popt-static","source":"RHSA-2026:77932"}],"prev":{"headline":"Vulnerabilities in IBM AIX and PowerVM VIOS","id":"CVE-2026-18835"},"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":"2026-08-05","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"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":"2026-10-16","vendors":["Red Hat","rpm-software-management"]},"summary":"A local attacker can cause a denial of service in applications using the popt library by triggering an integer underflow during help text formatting.","url":"https://insights.sbomify.com/CVE-2026-18839/"}