CVE-2026-0989

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using libxml2 from processing untrusted RelaxNG schema files. Implement strict input validation and sanitization for all RelaxNG schema inputs to prevent the parsing of maliciously crafted, deeply nested include directives."}], "timeline": [{"lang": "en", "time": "2026-01-15T12:36:12.129Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-01-15T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank lanbigking for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T17:49:13.622Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-15T16:31:12.583434Z", "id": "CVE-2026-0989", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-01-15T16:39:34.311Z"}}]}}

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The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk."}, {"lang": "es", "value": "Se identific\u00f3 un fallo en el analizador RelaxNG de libxml2 relacionado con la forma en que se gestionan las inclusiones de esquemas externos. El analizador no impone un l\u00edmite en la profundidad de inclusi\u00f3n al resolver directivas anidadas. Esquemas especialmente elaborados o excesivamente complejos pueden causar recursi\u00f3n excesiva durante el an\u00e1lisis. Esto puede provocar el agotamiento de la pila y ca\u00eddas de la aplicaci\u00f3n, creando un riesgo de denegaci\u00f3n de servicio."}], "id": "CVE-2026-0989", "lastModified": "2026-11-06T18:17:31.533", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-0989", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-15T16:31:12.583434Z", "version": "2.0.3"}}]}, "published": "2026-01-15T15:15:52.350", "references": [{"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2026:7519"}, {"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-0989"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429933"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Mitigation", "Third Party Advisory"], "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/998"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-674"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank lanbigking for reporting this issue.", "bugzilla": {"description": "libxml2: Unbounded RelaxNG Include Recursion Leading to Stack Overflow", "id": "2429933", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429933"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-674", "details": ["A flaw was identified in the RelaxNG parser of libxml2 related to how external schema inclusions are handled. The parser does not enforce a limit on inclusion depth when resolving nested <include> directives. Specially crafted or overly complex schemas can cause excessive recursion during parsing. This may lead to stack exhaustion and application crashes, creating a denial-of-service risk."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, restrict applications using libxml2 from processing untrusted RelaxNG schema files. Implement strict input validation and sanitization for all RelaxNG schema inputs to prevent the parsing of maliciously crafted, deeply nested include directives."}, "name": "CVE-2026-0989", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Fix deferred", "package_name": "libxml2", "product_name": "Red Hat JBoss Core Services"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-01-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-0989\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0989"], "statement": "This vulnerability is rated Low for Red Hat products. The flaw in libxml2's RelaxNG include handling requires attacker-controlled schema input to trigger unbounded recursion, leading to a denial of service. Exploitation is limited to scenarios where applications process untrusted RelaxNG schema files.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-15T16:40:00.963230+00:00", "value": {"mitigation_remediation": ["Restrict applications from processing untrusted RelaxNG schema files", "Implement strict input validation and sanitization for all RelaxNG schema inputs to prevent maliciously crafted nested includes", "Upgrade to the latest libxml2 release that limits recursion depth, once a vendor patch is available", "If a patch is not yet available, isolate services that parse external schemas or disable schema parsing for untrusted inputs"], "summary": {"action": "Apply Workaround", "impact": "Denial of Service via stack exhaustion due to unbounded RelaxNG include recursion"}, "threat_synthesis": {"affected_systems": "The vulnerability affects multiple Red\u202fHat products that bundle libxml2, including Red\u202fHat Enterprise Linux releases 6 through 10, Red\u202fHat Hardened Images, Red\u202fHat JBoss Core Services, and Red\u202fHat OpenShift Container Platform\u202f4. The specific libxml2 version in use is not listed, but any installation of libxml2 on the affected Red\u202fHat platforms is potentially susceptible.", "description_and_impact": "libxml2\u2019s RelaxNG parser processes nested <include> directives without limiting recursion depth, allowing specially crafted or deeply nested schemas to trigger stack exhaustion. The resulting overflow causes the calling application to crash, leading to a denial\u2011of\u2011service condition. The weakness corresponds to CWE\u2011674, which describes uncontrolled recursion. This flaw does not provide code execution or data disclosure but can disrupt availability of any service that parses untrusted RelaxNG schemas.", "risk_and_exploitability": "With a CVSS score of 3.7, the vulnerability represents a low severity risk. The EPSS score of less than 1\u202f% indicates an extremely low likelihood of exploitation. The CVE is not currently listed in the CISA KEV catalog. The likely attack vector involves an adversary supplying a malicious RelaxNG schema file to an application that processes such schemas with libxml2. No elevated privileges, network access, or local compromise are required beyond the ability to deliver an untrusted schema to the vulnerable process. If exploited, the outcome is a crash of the target application, which may affect service availability."}}}}, "created": "2026-04-15T18:15:10.862129+00:00", "updated": "2026-04-15T18:15:10.862147+00:00", "vendors": []}