CVE-2026-0992

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This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. 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Resource Consumption", "workarounds": [{"lang": "en", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}], "timeline": [{"lang": "en", "time": "2026-01-15T13:29:32.742Z", "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": "2026-11-06T17:49:14.534Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-01-15T16:31:06.823175Z", "id": "CVE-2026-0992", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": 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Esto conduce a un consumo excesivo de CPU y degrada la disponibilidad de la aplicaci\u00f3n, lo que resulta en una condici\u00f3n de denegaci\u00f3n de servicio."}], "id": "CVE-2026-0992", "lastModified": "2026-11-06T18:17:31.800", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "LOW", "baseScore": 2.9, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "version": "3.1"}, "exploitabilityScore": 1.4, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-0992", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-01-15T16:31:06.823175Z", "version": "2.0.3"}}]}, "published": "2026-01-15T15:15:52.657", "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-2026-0992"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429975"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Third Party Advisory"], "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/1019"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-400"}], "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 crafted XML catalogs", "id": "2429975", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2429975"}, "csaw": false, "cvss3": {"cvss3_base_score": "2.9", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-400", "details": ["A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."}, "name": "CVE-2026-0992", "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-2026-0992\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-0992"], "statement": "This vulnerability is rated Low for Red Hat. It affects applications that use the libxml2 library to process XML catalogs. An attacker must locally supply specially crafted XML catalogs containing repeated <nextCatalog> elements, which can lead to excessive CPU consumption and a denial-of-service condition due to redundant catalog chain traversal.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-15T16:39:43.640962+00:00", "value": {"mitigation_remediation": ["Upgrade libxml2 to the latest available version from the vendor that includes the fix for the catalog processing issue", "Restrict or validate the sources of XML catalogs so that only trusted inputs are processed by the application", "Implement process resource limits or monitoring to detect and mitigate abnormal CPU usage that could indicate an exploitation attempt"], "summary": {"action": "Apply Update", "impact": "Denial of Service via resource exhaustion"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red Hat ecosystems that use libxml2, including Red\u202fHat Enterprise Linux 10, 6, 7, 8, and 9; Red\u202fHat Hardened Images; Red\u202fHat JBoss Core Services; and Red\u202fHat OpenShift Container Platform\u202f4. The specific libxml2 version numbers affected are not listed in the available CVE data.", "description_and_impact": "A flaw in the libxml2 library allows an attacker to trigger excessive CPU consumption by supplying XML catalogs that contain repeated <nextCatalog> elements that reference the same downstream catalog. A parser will repeatedly traverse the same catalog chain, leading to uncontrolled resource consumption and application availability degradation. This denial\u2011of\u2011service condition is a form of resource exhaustion (CWE\u2011400).", "risk_and_exploitability": "The attack is remotely exploitable by supplying crafted XML catalogs, so an adversary with the ability to influence catalog inputs could trigger the denial of service. The CVSS score of 2.9 indicates low severity, and the EPSS of less than 1% suggests a very low likelihood of exploitation. The vulnerability is not included in the CISA KEV catalog. The absence of a vendor\u2011issued workaround means that protection relies on patching or mitigations at the application level."}}}}, "created": "2026-04-15T18:15:10.861718+00:00", "updated": "2026-04-15T18:15:10.861758+00:00", "vendors": []}