CVE-2026-1757

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When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. 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Missing Release of Memory after Effective Lifetime", "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": "2026-02-02T00:00:00.000Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-02-02T00:00:00.000Z", "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": "2026-11-06T07:51:45.914Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-02-02T17:35:15.061136Z", "id": "CVE-2026-1757", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical 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When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system."}, {"lang": "es", "value": "Se identific\u00f3 una falla en la shell interactiva de la utilidad xmllint, parte del proyecto libxml2, donde la memoria asignada para la entrada del usuario no se libera correctamente bajo ciertas condiciones. Cuando un usuario env\u00eda una entrada que consiste \u00fanicamente en espacios en blanco, el programa omite la ejecuci\u00f3n del comando pero no libera el b\u00fafer asignado. Repetir esta acci\u00f3n provoca que la memoria se acumule continuamente. Con el tiempo, esto puede agotar la memoria del sistema y terminar el proceso xmllint, creando una condici\u00f3n de denegaci\u00f3n de servicio en el sistema local."}], "id": "CVE-2026-1757", "lastModified": "2026-11-06T08:17:25.533", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "secalert@redhat.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1757", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-02T17:35:15.061136Z", "version": "2.0.3"}}]}, "published": "2026-02-02T13:15:58.580", "references": [{"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-2026-1757"}, {"source": "secalert@redhat.com", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2435940"}, {"source": "secalert@redhat.com", "url": "https://gitlab.gnome.org/GNOME/libxml2/-/issues/1009"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank lanbigking for reporting this issue.", "bugzilla": {"description": "libxml2: Memory Leak Leading to Local Denial of Service in xmllint Interactive Shell", "id": "2435940", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2435940"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-401", "details": ["A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system."], "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-2026-1757", "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": "Out of support scope", "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": "2026-02-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-1757\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1757"], "statement": "This MODERATE impact flaw in the `xmllint` interactive shell allows a local attacker to cause a denial of service. By repeatedly providing whitespace-only input, an attacker can trigger a memory leak, leading to resource exhaustion and process termination. Exploitation requires local access to the system and interaction with the `xmllint` interactive shell.", "threat_severity": "Moderate"}

{"analysis": {"en": {"generated_at": "2026-04-18T14:18:27.637175+00:00", "value": {"mitigation_remediation": ["Monitor Red\u00a0Hat security advisories for a future patch that resolves the memory\u2011leak problem.", "Restrict who can access the xmllint interactive shell, limiting usage to trusted administrators or services; consider removing execution permissions for broader user groups.", "Apply resource limits (ulimit, cgroup quotas, or similar controls) to the xmllint process to cap its memory consumption and mitigate system\u2011wide exhaustion."], "summary": {"action": "Monitor", "impact": "Local Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Red\u202fHat\u2011based products that ship the libxml2 package, including Red\u202fHat Enterprise Linux releases\u202f6 through\u202f10, Red\u202fHat Hardened Images, Red\u202fHat JBoss Core Services, and Red\u202fHat OpenShift Container Platform\u202f4. No specific libxml2 version is cited, so any distribution containing the vulnerable code may be impacted if not yet patched.", "description_and_impact": "A flaw exists in the interactive shell of the xmllint utility, part of libxml2, where memory allocated for user input is not released when the input consists only of whitespace. Repeated submissions cause increasing memory consumption, eventually exhausting system memory and terminating the xmllint process, creating a denial\u2011of\u2011service condition on the host.", "risk_and_exploitability": "The CVSS score of 6.2 classifies the issue as moderate severity, while the EPSS score of less than\u00a01% indicates that exploitation is unlikely but possible. The vulnerability is not listed in the CISA KEV catalog. Triggering the flaw requires local or user\u2011level access to run the interactive xmllint shell; elevated privileges are not needed. The denial of service is confined to the host where the shell is executed, and no remote exploitation path is documented."}}}}, "created": "2026-04-18T14:30:02.935647+00:00", "updated": "2026-04-18T14:30:02.935661+00:00", "vendors": []}