241 lines
11 KiB
JSON
241 lines
11 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-34479",
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"assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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"state": "PUBLISHED",
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"assignerShortName": "apache",
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"dateReserved": "2026-03-28T14:06:31.965Z",
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"datePublished": "2026-04-10T15:41:07.888Z",
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"dateUpdated": "2026-04-10T17:47:34.402Z"
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},
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"containers": {
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"cna": {
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"affected": [
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{
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"collectionURL": "https://repo.maven.apache.org/maven2",
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"cpes": [
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"cpe:2.3:a:apache:log4j_1_2_api:*:*:*:*:*:*:*:*"
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],
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"defaultStatus": "unaffected",
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"packageName": "org.apache.logging.log4j:log4j-1.2-api",
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"packageURL": "pkg:maven/org.apache.logging.log4j/log4j-1.2-api",
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"product": "Apache Log4j 1 to Log4j 2 bridge",
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"vendor": "Apache Software Foundation",
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"versions": [
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{
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"lessThan": "2.25.4",
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"status": "affected",
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"version": "2.7",
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"versionType": "maven"
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},
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{
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"lessThanOrEqual": "3.0.0-beta2",
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"status": "affected",
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"version": "3.0.0-alpha1",
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"versionType": "maven"
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}
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]
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}
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],
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"credits": [
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{
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"lang": "en",
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"type": "finder",
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"value": "Ap4sh (Samy Medjahed) and Ethicxz (Eliott Laurie) (original reporters)"
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},
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{
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"lang": "en",
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"type": "finder",
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"value": "jabaltarik1 (independently)"
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}
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],
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"descriptions": [
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{
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"lang": "en",
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"supportingMedia": [
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{
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"base64": false,
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"type": "text/html",
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"value": "<p>The <code>Log4j1XmlLayout</code> from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.</p><p>Two groups of users are affected:</p><ul><li>Those using <code>Log4j1XmlLayout</code> directly in a Log4j Core 2 configuration file.</li><li>Those using the Log4j 1 configuration compatibility layer with <code>org.apache.log4j.xml.XMLLayout</code> specified as the layout class.</li></ul><p>Users are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue.</p><p><strong>Note:</strong> The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the <a target=\"_blank\" rel=\"nofollow\" href=\"https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html\">Log4j 1 to Log4j 2 migration guide</a>, and specifically the section on eliminating reliance on the bridge.</p>"
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}
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],
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"value": "The Log4j1XmlLayout from the Apache Log4j 1-to-Log4j 2 bridge fails to escape characters forbidden by the XML 1.0 standard, producing malformed XML output. Conforming XML parsers are required to reject documents containing such characters with a fatal error, which may cause downstream log processing systems to drop or fail to index affected records.\n\nTwo groups of users are affected:\n\n * Those using Log4j1XmlLayout directly in a Log4j Core 2 configuration file.\n * Those using the Log4j 1 configuration compatibility layer with org.apache.log4j.xml.XMLLayout specified as the layout class.\n\n\nUsers are advised to upgrade to Apache Log4j 1-to-Log4j 2 bridge version 2.25.4, which corrects this issue.\n\nNote: The Apache Log4j 1-to-Log4j 2 bridge is deprecated and will not be present in Log4j 3. Users are encouraged to consult the Log4j 1 to Log4j 2 migration guide https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html , and specifically the section on eliminating reliance on the bridge."
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}
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],
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"metrics": [
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{
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"cvssV4_0": {
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"Automatable": "NOT_DEFINED",
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"Recovery": "NOT_DEFINED",
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"Safety": "NOT_DEFINED",
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"attackComplexity": "LOW",
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"attackRequirements": "NONE",
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"attackVector": "NETWORK",
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"baseScore": 6.9,
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"baseSeverity": "MEDIUM",
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"privilegesRequired": "NONE",
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"providerUrgency": "NOT_DEFINED",
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"subAvailabilityImpact": "NONE",
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"subConfidentialityImpact": "NONE",
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"subIntegrityImpact": "LOW",
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"userInteraction": "NONE",
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"valueDensity": "NOT_DEFINED",
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"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
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"version": "4.0",
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"vulnAvailabilityImpact": "NONE",
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"vulnConfidentialityImpact": "NONE",
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"vulnIntegrityImpact": "NONE",
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"vulnerabilityResponseEffort": "NOT_DEFINED"
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},
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"format": "CVSS",
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"scenarios": [
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{
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"lang": "en",
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"value": "GENERAL"
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}
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]
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},
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{
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"other": {
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"content": {
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"text": "moderate"
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},
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"type": "Textual description of severity"
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"cweId": "CWE-116",
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"description": "CWE-116 Improper Encoding or Escaping of Output",
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"lang": "en",
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"type": "CWE"
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}
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]
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}
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],
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"providerMetadata": {
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"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
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"shortName": "apache",
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"dateUpdated": "2026-04-10T15:41:07.888Z"
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},
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"references": [
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{
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"tags": [
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"patch"
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],
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"url": "https://github.com/apache/logging-log4j2/pull/4078"
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},
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{
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"tags": [
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"vendor-advisory"
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],
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"url": "https://logging.apache.org/security.html#CVE-2026-34479"
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},
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{
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"tags": [
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"vendor-advisory"
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],
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"url": "https://logging.apache.org/cyclonedx/vdr.xml"
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},
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{
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"tags": [
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"related"
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],
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"url": "https://logging.apache.org/log4j/2.x/migrate-from-log4j1.html"
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},
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{
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"tags": [
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"vendor-advisory"
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],
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"url": "https://lists.apache.org/thread/gd0hp6mj17rn3kj279vgy4p7kd4zz5on"
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}
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],
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"source": {
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"discovery": "EXTERNAL"
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},
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"timeline": [
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{
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"lang": "en",
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"time": "2026-02-16T17:11:00.000Z",
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"value": "Vulnerability reported by Ap4sh and ethicxz"
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},
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{
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"lang": "en",
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"time": "2026-03-15T05:39:00.000Z",
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"value": "Independent report received from jabaltarik1"
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},
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{
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"lang": "en",
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"time": "2026-03-24T18:56:00.000Z",
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"value": "Fix shared publicly by Piotr P. Karwasz as pull request #4078"
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},
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{
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"lang": "en",
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"time": "2026-03-25T09:46:00.000Z",
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"value": "Fix verified by reporter"
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},
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{
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"lang": "en",
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"time": "2026-03-28T11:19:00.000Z",
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"value": "Log4j 2.25.4 released"
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}
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],
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"title": "Apache Log4j 1 to Log4j 2 bridge: Silent log event loss in Log4j1XmlLayout due to unescaped XML 1.0 forbidden characters",
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"x_generator": {
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"engine": "Vulnogram 0.2.0"
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}
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},
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"adp": [
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{
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"title": "CVE Program Container",
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"references": [
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{
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"url": "http://www.openwall.com/lists/oss-security/2026/04/10/8"
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}
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],
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"providerMetadata": {
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"orgId": "af854a3a-2127-422b-91ae-364da2661108",
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"shortName": "CVE",
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"dateUpdated": "2026-04-10T16:18:18.699Z"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"timestamp": "2026-04-10T17:45:24.466114Z",
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"id": "CVE-2026-34479",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"role": "CISA Coordinator",
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"version": "2.0.3"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-04-10T17:47:34.402Z"
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}
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}
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]
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}
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} |