cve-2026-84501
MEDIUM CVSS 5.3 csaf_redhat
Description
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
Timeline
- Published
- 2026-09-16 09:28 UTC
- Last Modified
- 2026-09-28
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
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{
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},
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{
"cve": "CVE-2026-84501",
"cwe": {
"id": "CWE-117",
"name": "Improper Output Neutralization for Logs"
},
"discovery_date": "2026-09-16T09:42:27.569541+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2535096"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache ZooKeeper. An unauthenticated attacker can inject arbitrary fake log lines into the operational log by sending a specially crafted request containing newline characters. This vulnerability allows the attacker to forge complete log entries, including timestamps, log levels, and messages. These forged entries are visually indistinguishable from genuine ZooKeeper log output, which could lead to misinterpretation of system activity and hinder incident response efforts.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "zookeeper: Apache ZooKeeper: Operational log forgery via newline injection",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw was found in Apache ZooKeeper. Operational log entries can be forged via newline injection in ensemble authentication requests, allowing unauthenticated attackers to inject arbitrary log records. This may obscure malicious activity or create false audit trails. This issue affects Apache ZooKeeper versions 3.8.0 through 3.8.6 and 3.9.0 through 3.9.5.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-84501"
},
{
"category": "external",
"summary": "RHBZ#2535096",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2535096"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-84501",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-84501"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84501",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84501"
},
{
"category": "external",
"summary": "https://lists.apache.org/thread/ohby1g6zjt72p0w79rhbr41nczzvr33y",
"url": "https://lists.apache.org/thread/ohby1g6zjt72p0w79rhbr41nczzvr33y"
}
],
"release_date": "2026-09-16T09:28:10.294000+00:00",
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{
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
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}
],
"title": "zookeeper: Apache ZooKeeper: Operational log forgery via newline injection"
}
]
}