{"document":{"aggregate_severity":{"namespace":"https://www.suse.com/support/security/rating/","text":"moderate"},"category":"csaf_vex","csaf_version":"2.0","distribution":{"text":"Copyright 2024 SUSE LLC. All rights reserved.","tlp":{"label":"WHITE","url":"https://www.first.org/tlp/"}},"lang":"en","notes":[{"category":"summary","text":"SUSE CVE-2026-40023","title":"Title"},{"category":"description","text":"Apache Log4cxx's  XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the  XML 1.0 specification https://www.w3.org/TR/xml/#charsets  in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.\n\nAn attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity.\n\nUsers are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.","title":"Description of the CVE"},{"category":"legal_disclaimer","text":"CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).","title":"Terms of use"}],"publisher":{"category":"vendor","contact_details":"https://www.suse.com/support/security/contact/","name":"SUSE Product Security Team","namespace":"https://www.suse.com/"},"references":[{"category":"external","summary":"CVE-2026-40023","url":"https://www.suse.com/security/cve/CVE-2026-40023"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1261994 for CVE-2026-40023","url":"https://bugzilla.suse.com/1261994"}],"title":"SUSE CVE CVE-2026-40023","tracking":{"current_release_date":"2026-04-22T01:36:59Z","generator":{"date":"2026-04-13T23:25:54Z","engine":{"name":"cve-database.git:bin/generate-csaf-vex.pl","version":"1"}},"id":"CVE-2026-40023","initial_release_date":"2026-04-13T23:25:54Z","revision_history":[{"date":"2026-04-13T23:25:54Z","number":"2","summary":"references added,severity changed from  to moderate"},{"date":"2026-04-22T01:36:59Z","number":"3","summary":"vulnerabilities added"}],"status":"interim","version":"3"}},"product_tree":{"branches":[{"branches":[{"branches":[{"category":"product_name","name":"openSUSE Tumbleweed","product":{"name":"openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed","product_identification_helper":{"cpe":"cpe:/o:opensuse:tumbleweed"}}},{"category":"product_version","name":"liblog4cxx-devel-1.7.0-2.1","product":{"name":"liblog4cxx-devel-1.7.0-2.1","product_id":"liblog4cxx-devel-1.7.0-2.1","product_identification_helper":{"purl":"pkg:rpm/suse/liblog4cxx-devel@1.7.0-2.1"}}},{"category":"product_version","name":"liblog4cxx15-1.7.0-2.1","product":{"name":"liblog4cxx15-1.7.0-2.1","product_id":"liblog4cxx15-1.7.0-2.1","product_identification_helper":{"purl":"pkg:rpm/suse/liblog4cxx15@1.7.0-2.1"}}}],"category":"product_family","name":"SUSE Linux Enterprise"}],"category":"vendor","name":"SUSE"}],"relationships":[{"category":"default_component_of","full_product_name":{"name":"liblog4cxx-devel-1.7.0-2.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:liblog4cxx-devel-1.7.0-2.1"},"product_reference":"liblog4cxx-devel-1.7.0-2.1","relates_to_product_reference":"openSUSE Tumbleweed"},{"category":"default_component_of","full_product_name":{"name":"liblog4cxx15-1.7.0-2.1 as component of openSUSE Tumbleweed","product_id":"openSUSE Tumbleweed:liblog4cxx15-1.7.0-2.1"},"product_reference":"liblog4cxx15-1.7.0-2.1","relates_to_product_reference":"openSUSE Tumbleweed"}]},"vulnerabilities":[{"cve":"CVE-2026-40023","ids":[{"system_name":"SUSE CVE Page","text":"https://www.suse.com/security/cve/CVE-2026-40023"}],"notes":[{"category":"general","text":"Apache Log4cxx's  XMLLayout https://logging.apache.org/log4cxx/1.7.0/classlog4cxx_1_1xml_1_1XMLLayout.html , in versions before 1.7.0, fails to sanitize characters forbidden by the  XML 1.0 specification https://www.w3.org/TR/xml/#charsets  in log messages, NDC, and MDC property keys and values, producing invalid XML output. Conforming XML parsers must reject such documents with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.\n\nAn attacker who can influence logged data can exploit this to suppress individual log records, impairing audit trails and detection of malicious activity.\n\nUsers are advised to upgrade to Apache Log4cxx 1.7.0, which fixes this issue.","title":"CVE description"}],"product_status":{"recommended":["openSUSE Tumbleweed:liblog4cxx-devel-1.7.0-2.1","openSUSE Tumbleweed:liblog4cxx15-1.7.0-2.1"]},"references":[{"category":"external","summary":"CVE-2026-40023","url":"https://www.suse.com/security/cve/CVE-2026-40023"},{"category":"external","summary":"SUSE Security Ratings","url":"https://www.suse.com/support/security/rating/"},{"category":"external","summary":"SUSE Bug 1261994 for CVE-2026-40023","url":"https://bugzilla.suse.com/1261994"}],"remediations":[{"category":"vendor_fix","details":"To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n","product_ids":["openSUSE Tumbleweed:liblog4cxx-devel-1.7.0-2.1","openSUSE Tumbleweed:liblog4cxx15-1.7.0-2.1"]}],"scores":[{"cvss_v3":{"baseScore":5.3,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"products":["openSUSE Tumbleweed:liblog4cxx-devel-1.7.0-2.1","openSUSE Tumbleweed:liblog4cxx15-1.7.0-2.1"]}],"threats":[{"category":"impact","date":"2026-04-10T18:29:45Z","details":"moderate"}],"title":"CVE-2026-40023"}]}