{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Low" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-18839.json" } ], "title": "popt-devel: popt-static: size_t underflow in singleOptionHelp", "tracking": { "current_release_date": "2026-08-06T12:51:52+00:00", "generator": { "date": "2026-08-06T12:51:52+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.12" } }, "id": "CVE-2026-18839", "initial_release_date": "2026-08-05T18:56:50.736000+00:00", "revision_history": [ { "date": "2026-08-05T18:56:50.736000+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-08-06T07:40:36+00:00", "number": "2", "summary": "Current version" }, { "date": "2026-08-06T12:51:52+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 10", "product": { "name": "Red Hat Enterprise Linux 10", "product_id": "red_hat_enterprise_linux_10", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:10" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux 10" }, { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 6", "product": { "name": "Red Hat Enterprise Linux 6", "product_id": "red_hat_enterprise_linux_6", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:6" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux 6" }, { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 7", "product": { "name": "Red Hat Enterprise Linux 7", "product_id": "red_hat_enterprise_linux_7", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:7" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux 7" }, { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 8", "product": { "name": "Red Hat Enterprise Linux 8", "product_id": "red_hat_enterprise_linux_8", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:8" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux 8" }, { "branches": [ { "category": "product_name", "name": "Red Hat Enterprise Linux 9", "product": { "name": "Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9", "product_identification_helper": { "cpe": "cpe:/o:redhat:enterprise_linux:9" } } } ], "category": "product_family", "name": "Red Hat Enterprise Linux 9" }, { "branches": [ { "category": "product_name", "name": "Red Hat Hardened Images", "product": { "name": "Red Hat Hardened Images", "product_id": "red_hat_hardened_images", "product_identification_helper": { "cpe": "cpe:/a:redhat:hummingbird:1" } } } ], "category": "product_family", "name": "Red Hat Hardened Images" }, { "branches": [ { "category": "product_name", "name": "Red Hat OpenShift Container Platform 4", "product": { "name": "Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift:4" } } } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" }, { "category": "product_version", "name": "popt.src", "product": { "name": "popt.src", "product_id": "popt.src", "product_identification_helper": { "purl": "pkg:rpm/redhat/popt@1.19-8.el10?arch=src" } } }, { "category": "product_version", "name": "popt-devel", "product": { "name": "popt-devel", "product_id": "popt-devel", "product_identification_helper": { "purl": "pkg:rpm/redhat/popt-devel" } } }, { "category": "product_version", "name": "popt-static", "product": { "name": "popt-static", "product_id": "popt-static", "product_identification_helper": { "purl": "pkg:rpm/redhat/popt-static" } } }, { "category": "product_version", "name": "rhcos", "product": { "name": "rhcos", "product_id": "rhcos", "product_identification_helper": { "purl": "pkg:generic/redhat/rhcos@412.86.202407192342-0" } } } ], "category": "vendor", "name": "Red Hat" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "popt-devel as a component of Red Hat Enterprise Linux 10", "product_id": "red_hat_enterprise_linux_10:popt-devel" }, "product_reference": "popt-devel", "relates_to_product_reference": "red_hat_enterprise_linux_10" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Enterprise Linux 10", "product_id": "red_hat_enterprise_linux_10:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_enterprise_linux_10" }, { "category": "default_component_of", "full_product_name": { "name": "popt-devel as a component of Red Hat Enterprise Linux 6", "product_id": "red_hat_enterprise_linux_6:popt-devel" }, "product_reference": "popt-devel", "relates_to_product_reference": "red_hat_enterprise_linux_6" }, { "category": "default_component_of", "full_product_name": { "name": "popt-static as a component of Red Hat Enterprise Linux 6", "product_id": "red_hat_enterprise_linux_6:popt-static" }, "product_reference": "popt-static", "relates_to_product_reference": "red_hat_enterprise_linux_6" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Enterprise Linux 6", "product_id": "red_hat_enterprise_linux_6:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_enterprise_linux_6" }, { "category": "default_component_of", "full_product_name": { "name": "popt-devel as a component of Red Hat Enterprise Linux 7", "product_id": "red_hat_enterprise_linux_7:popt-devel" }, "product_reference": "popt-devel", "relates_to_product_reference": "red_hat_enterprise_linux_7" }, { "category": "default_component_of", "full_product_name": { "name": "popt-static as a component of Red Hat Enterprise Linux 7", "product_id": "red_hat_enterprise_linux_7:popt-static" }, "product_reference": "popt-static", "relates_to_product_reference": "red_hat_enterprise_linux_7" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Enterprise Linux 7", "product_id": "red_hat_enterprise_linux_7:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_enterprise_linux_7" }, { "category": "default_component_of", "full_product_name": { "name": "popt-devel as a component of Red Hat Enterprise Linux 8", "product_id": "red_hat_enterprise_linux_8:popt-devel" }, "product_reference": "popt-devel", "relates_to_product_reference": "red_hat_enterprise_linux_8" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Enterprise Linux 8", "product_id": "red_hat_enterprise_linux_8:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_enterprise_linux_8" }, { "category": "default_component_of", "full_product_name": { "name": "popt-devel as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:popt-devel" }, "product_reference": "popt-devel", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Enterprise Linux 9", "product_id": "red_hat_enterprise_linux_9:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_enterprise_linux_9" }, { "category": "default_component_of", "full_product_name": { "name": "popt.src as a component of Red Hat Hardened Images", "product_id": "red_hat_hardened_images:popt.src" }, "product_reference": "popt.src", "relates_to_product_reference": "red_hat_hardened_images" }, { "category": "default_component_of", "full_product_name": { "name": "rhcos as a component of Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4:rhcos" }, "product_reference": "rhcos", "relates_to_product_reference": "red_hat_openshift_container_platform_4" } ] }, "vulnerabilities": [ { "acknowledgments": [ { "names": [ "Matanya Moses" ], "organization": "Checkpoint" } ], "cve": "CVE-2026-18839", "cwe": { "id": "CWE-191", "name": "Integer Underflow (Wrap or Wraparound)" }, "discovery_date": "2026-08-04T14:14:22.907000+00:00", "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2511010" } ], "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" }, { "category": "summary", "text": "popt-devel: popt-static: size_t underflow in singleOptionHelp", "title": "Vulnerability summary" }, { "category": "other", "text": "This is a Low impact vulnerability where a size_t underflow in the popt library's help formatting function can occur when an application's option table is displayed in a narrow terminal with large option widths. This could potentially lead to memory allocation failures or out-of-bounds writes, but requires specific user interaction and terminal conditions, limiting its exploitability and overall risk.", "title": "Statement" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" } ], "product_status": { "known_affected": [ "red_hat_enterprise_linux_10:popt-devel", "red_hat_enterprise_linux_10:popt.src", "red_hat_enterprise_linux_6:popt-devel", "red_hat_enterprise_linux_6:popt-static", "red_hat_enterprise_linux_6:popt.src", "red_hat_enterprise_linux_7:popt-devel", "red_hat_enterprise_linux_7:popt-static", "red_hat_enterprise_linux_7:popt.src", "red_hat_enterprise_linux_8:popt-devel", "red_hat_enterprise_linux_8:popt.src", "red_hat_enterprise_linux_9:popt-devel", "red_hat_enterprise_linux_9:popt.src", "red_hat_hardened_images:popt.src", "red_hat_openshift_container_platform_4:rhcos" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-18839" }, { "category": "external", "summary": "RHBZ#2511010", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2511010" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-18839", "url": "https://www.cve.org/CVERecord?id=CVE-2026-18839" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-18839", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18839" } ], "release_date": "2026-08-05T18:56:50.736000+00:00", "remediations": [ { "category": "no_fix_planned", "details": "Out of support scope", "product_ids": [ "red_hat_enterprise_linux_6:popt-devel", "red_hat_enterprise_linux_6:popt-static", "red_hat_enterprise_linux_6:popt.src" ] }, { "category": "none_available", "details": "Fix deferred", "product_ids": [ "red_hat_enterprise_linux_10:popt-devel", "red_hat_enterprise_linux_10:popt.src", "red_hat_enterprise_linux_7:popt-devel", "red_hat_enterprise_linux_7:popt-static", "red_hat_enterprise_linux_7:popt.src", "red_hat_enterprise_linux_8:popt-devel", "red_hat_enterprise_linux_8:popt.src", "red_hat_enterprise_linux_9:popt-devel", "red_hat_enterprise_linux_9:popt.src", "red_hat_openshift_container_platform_4:rhcos" ] }, { "category": "none_available", "details": "Affected", "product_ids": [ "red_hat_hardened_images:popt.src" ] } ], "scores": [ { "cvss_v3": { "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" }, "products": [ "red_hat_enterprise_linux_10:popt-devel", "red_hat_enterprise_linux_10:popt.src", "red_hat_enterprise_linux_6:popt-devel", "red_hat_enterprise_linux_6:popt-static", "red_hat_enterprise_linux_6:popt.src", "red_hat_enterprise_linux_7:popt-devel", "red_hat_enterprise_linux_7:popt-static", "red_hat_enterprise_linux_7:popt.src", "red_hat_enterprise_linux_8:popt-devel", "red_hat_enterprise_linux_8:popt.src", "red_hat_enterprise_linux_9:popt-devel", "red_hat_enterprise_linux_9:popt.src", "red_hat_hardened_images:popt.src", "red_hat_openshift_container_platform_4:rhcos" ] } ], "threats": [ { "category": "impact", "details": "Low", "product_ids": [ "red_hat_enterprise_linux_10:popt-devel", "red_hat_enterprise_linux_10:popt.src", "red_hat_enterprise_linux_6:popt-devel", "red_hat_enterprise_linux_6:popt-static", "red_hat_enterprise_linux_6:popt.src", "red_hat_enterprise_linux_7:popt-devel", "red_hat_enterprise_linux_7:popt-static", "red_hat_enterprise_linux_7:popt.src", "red_hat_enterprise_linux_8:popt-devel", "red_hat_enterprise_linux_8:popt.src", "red_hat_enterprise_linux_9:popt-devel", "red_hat_enterprise_linux_9:popt.src", "red_hat_hardened_images:popt.src", "red_hat_openshift_container_platform_4:rhcos" ] } ], "title": "popt-devel: popt-static: size_t underflow in singleOptionHelp" } ] }