CVE-2026-0990

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This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. 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"workarounds": [{"lang": "en", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}], "timeline": [{"lang": "en", "time": "2026-01-15T13:15:23.187Z", "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 Nick Wellnhofer for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-11-06T07:49:46.646Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-15T16:31:20.247968Z", "id": "CVE-2026-0990", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", 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Esto finalmente resulta en una falla de segmentaci\u00f3n, causando una denegaci\u00f3n de servicio (DoS) al bloquear las aplicaciones afectadas."}], "id": "CVE-2026-0990", "lastModified": "2026-11-06T08:17:16.713", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "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:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-0990", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-15T16:31:20.247968Z", "version": "2.0.3"}}]}, "published": "2026-01-15T15:15:52.503", "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-2026-0990"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429959"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/1018"}], "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 Nick Wellnhofer for reporting this issue.", "bugzilla": {"description": "libxml2: libxml2: Denial of Service via uncontrolled recursion in XML catalog processing", "id": "2429959", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429959"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-674", "details": ["A flaw was found in libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-0990", "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-2026-0990\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0990"], "statement": "This vulnerability is rated Moderate for Red Hat products. The flaw in libxml2, an XML parsing library, is configuration-dependent and occurs when processing specially crafted XML catalogs with self-referencing delegate URI entries. Exploitation requires an attacker to provide such a catalog, leading to a Denial of Service by crashing affected applications.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-15T16:40:25.434159+00:00", "value": {"mitigation_remediation": ["Upgrade libxml2 to a version that contains the fix for uncontrolled recursion.", "If an immediate update is not possible, disable or restrict external XML catalog processing in applications that use libxml2 to prevent untrusted input from triggering recursion.", "Ensure XML configuration files and catalog directories are writable only by trusted administrators and are not exposed to untrusted users or network services."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "Red Hat Enterprise Linux 6 through 10, Red Hat Hardened Images, Red Hat JBoss Core Services, Red Hat OpenShift Container Platform 4, and Red Hat Hummingbird 1 are affected. These systems rely on libxml2 for XML parsing and catalog processing.", "description_and_impact": "The vulnerability arises from unrestricted recursion in libxml2 when a self\u2011referencing delegate URI is present in an XML catalog. The bug causes infinite recursion in the xmlCatalogXMLResolveURI function, exhausting the call stack and ultimately resulting in a segmentation fault. This crash of the parsing library leads to a denial of service by terminating the affected application. The weakness is identified as CWE\u2011674 (Uncontrolled Recursion).", "risk_and_exploitability": "The CVSS score of 5.9 indicates a medium severity. The EPSS score of less than 1% suggests a very low probability of exploitation in the current environment. The vulnerability is not listed in the CISA KEV catalog. An attacker would need remote or configuration access to supply a specially crafted XML catalog containing a self\u2011referencing delegate URI. If successful, the attacker could force the application to crash, denying service to legitimate users. The primary attack vector is remote or configuration-dependent input into the XML catalog system."}}}}, "created": "2026-04-15T18:15:10.862525+00:00", "updated": "2026-04-15T18:15:10.862542+00:00", "vendors": []}