CVE-2026-34481

{"id": "CVE-2026-34481", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34481", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-10T17:41:23.224802Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}], "cvssMetricV40": [{"type": "Secondary", "source": "security@apache.org", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.3, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "LOW", "vulnIntegrityImpact": "NONE", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security@apache.org", "affectedData": [{"cpes": ["cpe:2.3:a:apache:log4j_layout_template_json:*:*:*:*:*:*:*:*"], "vendor": "Apache Software Foundation", "product": "Apache Log4j JSON Template Layout", "versions": [{"status": "affected", "version": "2.14.0", "lessThan": "2.25.4", "versionType": "maven"}, {"status": "affected", "version": "3.0.0-alpha1", "versionType": "maven", "lessThanOrEqual": "3.0.0-beta3"}], "packageURL": "pkg:maven/org.apache.logging.log4j/log4j-layout-template-json", "packageName": "org.apache.logging.log4j:log4j-layout-template-json", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}]}], "published": "2026-04-10T16:16:31.663", "references": [{"url": "https://github.com/apache/logging-log4j2/pull/4080", "tags": ["Issue Tracking"], "source": "security@apache.org"}, {"url": "https://lists.apache.org/thread/n34zdv00gbkdbzt2rx9rf5mqz6lhopcv", "tags": ["Mailing List", "Vendor Advisory"], "source": "security@apache.org"}, {"url": "https://logging.apache.org/cyclonedx/vdr.xml", "tags": ["Product"], "source": "security@apache.org"}, {"url": "https://logging.apache.org/log4j/2.x/manual/json-template-layout.html", "tags": ["Technical Description"], "source": "security@apache.org"}, {"url": "https://logging.apache.org/security.html#CVE-2026-34481", "tags": ["Vendor Advisory"], "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/04/10/10", "tags": ["Mailing List", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-116"}]}], "descriptions": [{"lang": "en", "value": "Apache Log4j's JsonTemplateLayout https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , in versions up to and including 2.25.3, produces invalid JSON output when log events contain non-finite floating-point values (NaN, Infinity, or -Infinity), which are prohibited by RFC 8259. This may cause downstream log processing systems to reject or fail to index affected records.\n\nAn attacker can exploit this issue only if both of the following conditions are met:\n\n * The application uses JsonTemplateLayout.\n * The application logs a MapMessage, or logs an object directly (e.g., via Logger.info(Object), which wraps it in an ObjectMessage), where the message contains an attacker-controlled floating-point value.\n\n\nUsers are advised to upgrade to Apache Log4j JSON Template Layout 2.25.4, which corrects this issue.\n\nNote: The fix released in version 2.25.4 did not cover all affected code paths. CVE-2026-49844 was assigned to the remaining issue, which concerns the MapMessage.asJson() serialization in Apache Log4j API and is fixed in versions 2.25.5 and 2.26.1."}, {"lang": "es", "value": "El JsonTemplateLayout de Apache Log4j https://logging.apache.org/log4j/2.x/manual/json-template-layout.html , en versiones hasta la 2.25.3 inclusive, produce una salida JSON no v\u00e1lida cuando los eventos de registro contienen valores de punto flotante no finitos (NaN, Infinity o -Infinity), los cuales est\u00e1n prohibidos por el RFC 8259. Esto puede hacer que los sistemas de procesamiento de registros posteriores rechacen o no puedan indexar los registros afectados.\n\nUn atacante puede explotar este problema solo si se cumplen las dos condiciones siguientes:\n\n * La aplicaci\u00f3n utiliza JsonTemplateLayout.\n * La aplicaci\u00f3n registra un MapMessage que contiene un valor de punto flotante controlado por el atacante.\n\nSe aconseja a los usuarios actualizar a Apache Log4j JSON Template Layout 2.25.4, que corrige este problema."}], "lastModified": "2026-10-26T22:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FED62F2E-60EF-45CB-9F07-F6904145C372", "versionEndExcluding": "2.25.4", "versionStartIncluding": "2.14.0"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:alpha1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "5EE518C3-2F43-40FF-B754-C340B7003FC7"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6D2A01C1-D56C-4198-8ADB-11739F791E2B"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:alpha1_rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D6F8BD61-DD30-4D64-842C-850E5B117036"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:beta1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ED00C38D-27EA-489C-9A2B-3594ACA8A3C5"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:beta2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8794D719-1D90-4378-B48B-698EA40FBFB2"}, {"criteria": "cpe:2.3:a:apache:log4j:3.0.0:beta3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "74C9FCBD-ECAD-4C29-B97A-2B9D97C0FC1F"}], "operator": "OR"}]}], "sourceIdentifier": "security@apache.org"}