CVE-2025-49794

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2025-49794", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2025-06-10T22:17:05.286Z", "datePublished": "2025-06-16T15:24:31.020Z", "dateUpdated": "2026-11-04T21:35:53.489Z"}, "containers": {"cna": {"title": "Libxml: heap use after free (uaf) leads to denial of service (dos)", "metrics": [{"other": {"content": {"value": "Important", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path=\"...\"/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors."}], "affected": [{"versions": [{"status": "affected", "version": "0", "lessThan": "2.15.0", "versionType": "semver"}], "packageName": "libxml2", "collectionURL": "https://gitlab.gnome.org/GNOME/libxml2/", "defaultStatus": "unaffected"}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libxml2", "defaultStatus": "affected", "versions": [{"version": "0:2.12.5-7.el10_0", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/o:redhat:enterprise_linux:10.0"]}, {"vendor": "Red Hat", "product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "libxml2", "defaultStatus": 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This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path=\"...\"/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors."}, {"lang": "es", "value": "Se detect\u00f3 una vulnerabilidad de use-after-free en libxml2. Este problema se produce al analizar elementos XPath en ciertas circunstancias cuando el esquema XML contiene los elementos de esquema . Esta falla permite a un actor malicioso manipular un documento XML malicioso que se utiliza como entrada para libxml, lo que provoca el bloqueo del programa al usar libxml u otros posibles comportamientos indefinidos."}], "id": "CVE-2025-49794", "lastModified": "2026-11-04T22:17:36.413", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.2, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-49794", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2025-06-16T15:50:46.041375Z", "version": "2.0.3"}}]}, "published": "2025-06-16T16:15:18.997", "references": [{"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:10630"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:10698"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:10699"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:11580"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12098"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12099"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12199"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12237"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12239"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12240"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:12241"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:13335"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:15397"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:15827"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:15828"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:18217"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:18218"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:18219"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:18240"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:19020"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:19041"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:19046"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:19894"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2025:21913"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:0934"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:62549"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:67857"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/errata/RHSA-2026:7519"}, {"source": "secalert@redhat.com", "url": "https://access.redhat.com/security/cve/CVE-2025-49794"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2372373"}, {"source": "secalert@redhat.com", "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/931"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00014.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-253495.html"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-577017.html"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-825"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:10630", "cpe": "cpe:/o:redhat:enterprise_linux:10.0", "package": "libxml2-0:2.12.5-7.el10_0", "product_name": "Red Hat Enterprise Linux 10", "release_date": "2025-07-08T00:00:00Z"}, {"advisory": "RHSA-2025:10698", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "libxml2-0:2.9.7-21.el8_10.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-09T00:00:00Z"}, {"advisory": "RHSA-2025:10698", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "libxml2-0:2.9.7-21.el8_10.1", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2025-07-09T00:00:00Z"}, {"advisory": "RHSA-2025:10699", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "libxml2-0:2.9.13-10.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-09T00:00:00Z"}, {"advisory": "RHSA-2025:10699", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "libxml2-0:2.9.13-10.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-07-09T00:00:00Z"}], "bugzilla": {"description": "libxml: Heap use after free (UAF) leads to Denial of service (DoS)", "id": "2372373", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2372373"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H", "status": "verified"}, "cwe": "CWE-825", "details": ["A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path=\"...\"/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.", "A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path=\"...\"/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors."], "mitigation": {"lang": "en:us", "value": "There's no available mitigation other than avoid processing untrusted XML documents before updating to the libxml version containing the fix."}, "name": "CVE-2025-49794", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "libxml2", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Affected", "package_name": "libxml2", "product_name": "Red Hat JBoss Core Services"}], "public_date": "2025-06-10T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-49794\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-49794"], "statement": "This issue was rated with a severity impact of Important by Red Hat Product Security, as libxml can be used to parse XML coming from the network depending on how the program consumes it and uses the library. Additionally, although the initial report shows a crash due to invalid memory access (A:H), other undefined issues that can present data integrity due to the application overwriting sensitive data are not discarded (I:H).", "threat_severity": "Important"}

{"analysis": {"en": {"generated_at": "2026-04-20T16:24:20.781212+00:00", "value": {"mitigation_remediation": ["Update the system or application to the latest Red\u00a0Hat errata that includes the libxml2 upgrade (e.g., RHSA\u20112025:10630 and related packages).", "As a temporary measure, avoid processing untrusted XML data until the libxml2 fix is installed; validate or sanitize XML input before parsing.", "Monitor system logs for libxml2 crashes or segmentation faults that may indicate exploitation attempts."], "summary": {"action": "Apply Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected products are all Red\u00a0Hat offerings that ship libxml2, including Red\u00a0Hat Enterprise Linux 6, 7, 8, 9, and 10, as well as several Red\u00a0Hat OpenShift Container Platforms (4.12 through 4.20) and the cert\u2011manager operator for OpenShift. Multiple Red\u00a0Hat Insights, Automatic Update Services, and hardened images are also impacted.", "description_and_impact": "A use\u2011after\u2011free occurs in libxml2 when parsing an XML document that contains a schematron <sch:name path=\"...\"/> element. The flaw allows an attacker to craft a malicious XML file that causes libxml2 to dereference freed memory, leading to a crash or other undefined behavior. The result is a denial of service, with the application terminating unexpectedly. This is a classic CWE\u2011825 issue.", "risk_and_exploitability": "The CVSS score of 9.1 indicates a high\u2011severity vulnerability, while the EPSS score of less than 1% suggests low overall exploitation probability. The vulnerability is not currently listed in CISA\u2019s KEV catalog. The likely attack vector is the exposure of a component that processes XML input; an attacker who can supply a crafted XML document can trigger the crash, which may be performed locally or remotely depending on the application\u2019s exposure. Continued monitoring for unexpected crashes can help detect attempts while a patch is applied."}}}}, "created": "2026-04-20T16:30:06.289859+00:00", "updated": "2026-04-20T16:30:06.289876+00:00", "vendors": []}