{"api_version":"1","generated_at":"2026-08-06T00:42:49+00:00","cve":"CVE-2026-18839","urls":{"html":"https://cve.report/CVE-2026-18839","api":"https://cve.report/api/cve/CVE-2026-18839.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-18839","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-18839"},"summary":{"title":"Popt-devel: popt-static: size_t underflow in singleoptionhelp","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.","state":"PUBLISHED","assigner":"redhat","published_at":"2026-08-05 21:16:57","updated_at":"2026-08-05 22:17:07"},"problem_types":["CWE-191","CWE-191 Integer Underflow (Wrap or Wraparound)"],"metrics":[{"version":"3.1","source":"secalert@redhat.com","type":"Secondary","score":"2.2","severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","baseScore":2.2,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"2.2","severity":"LOW","vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","data":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":2.2,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","version":"3.1"}}],"references":[{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2511010","name":"https://bugzilla.redhat.com/show_bug.cgi?id=2511010","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://access.redhat.com/security/cve/CVE-2026-18839","name":"https://access.redhat.com/security/cve/CVE-2026-18839","refsource":"secalert@redhat.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18839","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18839","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"rpm-software-management","product":"popt","version":"affected 1.13 * semver","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 6","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat Hardened Images","version":"","platforms":[]},{"source":"CNA","vendor":"Red Hat","product":"Red Hat OpenShift Container Platform 4","version":"","platforms":[]}],"timeline":[{"source":"CNA","time":"2026-08-04T14:14:22.907Z","lang":"en","value":"Reported to Red Hat."},{"source":"CNA","time":"2026-08-05T18:56:50.736Z","lang":"en","value":"Made public."}],"solutions":[],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Red Hat would like to thank Matanya Moses (Checkpoint) for reporting this issue.","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"collectionURL":"https://github.com/rpm-software-management/popt","defaultStatus":"unaffected","packageName":"popt","product":"popt","vendor":"rpm-software-management","versions":[{"lessThan":"*","status":"affected","version":"1.13","versionType":"semver"}]},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:10"],"defaultStatus":"affected","packageName":"popt","product":"Red Hat Enterprise Linux 10","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:6"],"defaultStatus":"unknown","packageName":"popt","product":"Red Hat Enterprise Linux 6","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:7"],"defaultStatus":"affected","packageName":"popt","product":"Red Hat Enterprise Linux 7","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:8"],"defaultStatus":"affected","packageName":"popt","product":"Red Hat Enterprise Linux 8","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/o:redhat:enterprise_linux:9"],"defaultStatus":"affected","packageName":"popt","product":"Red Hat Enterprise Linux 9","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:hummingbird:1"],"defaultStatus":"affected","packageName":"popt","product":"Red Hat Hardened Images","vendor":"Red Hat"},{"collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:openshift:4"],"defaultStatus":"affected","packageName":"rhcos","product":"Red Hat OpenShift Container Platform 4","vendor":"Red Hat"}],"credits":[{"lang":"en","value":"Red Hat would like to thank Matanya Moses (Checkpoint) for reporting this issue."}],"datePublic":"2026-08-05T18:56:50.736Z","descriptions":[{"lang":"en","value":"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."}],"metrics":[{"other":{"content":{"namespace":"https://access.redhat.com/security/updates/classification/","value":"Low"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"LOCAL","availabilityImpact":"LOW","baseScore":2.2,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"format":"CVSS"}],"problemTypes":[{"descriptions":[{"cweId":"CWE-191","description":"Integer Underflow (Wrap or Wraparound)","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-05T21:44:08.177Z","orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat"},"references":[{"tags":["vdb-entry","x_refsource_REDHAT"],"url":"https://access.redhat.com/security/cve/CVE-2026-18839"},{"name":"RHBZ#2511010","tags":["issue-tracking","x_refsource_REDHAT"],"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2511010"}],"timeline":[{"lang":"en","time":"2026-08-04T14:14:22.907Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-08-05T18:56:50.736Z","value":"Made public."}],"title":"Popt-devel: popt-static: size_t underflow in singleoptionhelp","x_generator":{"engine":"cvelib 1.8.0"},"x_redhatCweChain":"CWE-191: Integer Underflow (Wrap or Wraparound)"}},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2026-18839","datePublished":"2026-08-05T20:45:17.163Z","dateReserved":"2026-08-04T14:41:25.490Z","dateUpdated":"2026-08-05T21:44:08.177Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-05 21:16:57","lastModifiedDate":"2026-08-05 22:17:07","problem_types":["CWE-191","CWE-191 Integer Underflow (Wrap or Wraparound)"],"metrics":{"cvssMetricV31":[{"source":"secalert@redhat.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:N/A:L","baseScore":2.2,"baseSeverity":"LOW","attackVector":"LOCAL","attackComplexity":"HIGH","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW"},"exploitabilityScore":0.8,"impactScore":1.4}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"18839","Ordinal":"1","Title":"Popt-devel: popt-static: size_t underflow in singleoptionhelp","CVE":"CVE-2026-18839","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"18839","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Popt-devel: popt-static: size_t underflow in singleoptionhelp"}]}}}