CVE-2026-84501

{"id": "CVE-2026-84501", "cveTags": [], "metrics": {}, "affected": [{"source": "security@apache.org", "affectedData": [{"vendor": "Apache Software Foundation", "product": "Apache ZooKeeper", "versions": [{"status": "affected", "version": "3.9.0", "versionType": "maven", "lessThanOrEqual": "3.9.5"}, {"status": "affected", "version": "3.8.0", "versionType": "maven", "lessThanOrEqual": "3.8.6"}], "packageURL": "pkg:maven/org.apache.zookeeper/zookeeper", "packageName": "org.apache.zookeeper:zookeeper", "collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected"}]}], "published": "2026-09-16T10:16:53.557", "references": [{"url": "https://lists.apache.org/thread/ohby1g6zjt72p0w79rhbr41nczzvr33y", "source": "security@apache.org"}, {"url": "http://www.openwall.com/lists/oss-security/2026/09/15/7", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Received", "weaknesses": [{"type": "Secondary", "source": "security@apache.org", "description": [{"lang": "en", "value": "CWE-117"}]}], "descriptions": [{"lang": "en", "value": "An unauthenticated attacker can inject arbitrary fake log lines into Apache ZooKeeper's operational log by sending a crafted add_auth(\"ensemble\", ...) request containing newline characters (\\n). When the ensemble name doesn't match, EnsembleAuthenticationProvider.handleAuthentication() logs the raw, unsanitized name via LOG.warn(). Because SLF4J's {} placeholder preserves embedded newlines, the attacker can forge complete log entries \u2014 with arbitrary timestamps, log levels, class names, and messages \u2014 that are visually indistinguishable from genuine ZooKeeper log output.\n\nThis issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6.\n\nUsers are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue."}], "lastModified": "2026-09-16T11:16:43.650", "sourceIdentifier": "security@apache.org"}