CVE-2025-66382

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{"bugzilla": {"description": "libexpat: libexpat: Denial of service via crafted file processing", "id": "2417661", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2417661"}, "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-407", "details": ["A flaw was found in libexpat. This vulnerability allows a denial of service (DoS) by processing a crafted file with an approximate size of 2 MiB, leading to dozens of seconds of processing time."], "name": "CVE-2025-66382", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "expat", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "compat-expat1", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "expat", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "expat", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "expat", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "mingw-expat", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "xmlrpc-c", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "expat", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:jboss_core_services:1", "fix_state": "Fix deferred", "package_name": "expat", "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": "2025-11-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-66382\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-66382\nhttps://github.com/libexpat/libexpat/issues/1076"], "statement": "The highest threat of this flaw is to system availability. This issue affects systems that process untrusted XML files with libexpat, where a specially crafted file can lead to extended processing times, potentially causing a denial of service.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-20T21:34:51.775142+00:00", "value": {"mitigation_remediation": ["Identify all installations of libexpat\u202f\u2264\u202f2.7.3 and note the associated application components.", "Apply the official patch by upgrading to libexpat\u202f\u2265\u202f2.7.4 or any newer release where the issue is resolved.", "Implement file-size validation or payload limits before invoking the XML parser to reject files approaching 2\u202fMiB.", "Configure application or system resource limits and timeouts around XML parsing operations to avoid long processing times."], "summary": {"action": "Assess Impact", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The issue affects libexpat in all releases through 2.7.3 distributed by the libexpat project. Systems that use this library \u2013 for example application servers, command\u2011line tools, and embedded controllers \u2013 are vulnerable if they compile or link against these versions. No later versions are affected, and the problem is resolved in the 2.7.4 release.", "description_and_impact": "The library creates a denial\u2011of\u2011service condition when processing a file that is roughly 2\u202fMiB in size, causing the parser to consume dozens of seconds of CPU time. The weakness is classified as CWE\u2011407. Based on the description, it is inferred that attackers can trigger this cost\u2011heavy parsing by submitting a specifically\u2011crafted document to any process that loads libexpat for XML processing.", "risk_and_exploitability": "The CVSS score of 2.9 reflects a low overall severity, and the EPSS score of less than 1% indicates a very small probability of exploitation in the wild. The vulnerability is not listed in CISA\u2019s KEV catalog, further suggesting limited current exploitation. The remediation path requires an attacker to provide the offending file to the parsing component, so this attack is most feasible in a local or remote context where an application accepts untrusted input. A well\u2011timed large input can disrupt service availability, but it does not allow code execution or data exfiltration."}}}}, "created": "2026-04-20T21:45:18.961252+00:00", "updated": "2026-04-20T21:45:18.961264+00:00", "vendors": []}