{"answers":{"affected":"1 open source package ship an affected version, including zookeeper. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-84439 in the wild and no public exploit code.","fix":"Upgrade zookeeper to a fixed version for your release line: 3.8.7 or 3.9.6.","what":"CVE-2026-84439 is a medium-severity vulnerability in Apache ZooKeeper, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-84439 and fix it if it is affected.\n\nWhat it is: CVE-2026-84439 is a medium-severity vulnerability in Apache ZooKeeper, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-84439 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- zookeeper (Bitnami): affected from 3.8.0; fixed in 3.8.7, 3.9.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-84439/ (Markdown: https://insights.sbomify.com/CVE-2026-84439/index.md)","id":"CVE-2026-84439","markdown":"https://insights.sbomify.com/CVE-2026-84439/index.md","name":"CVE-2026-84439","record":{"aliases":["BIT-zookeeper-2026-84439","CLEANSTART-2026-DM89107","CLEANSTART-2026-MZ33445","CLEANSTART-2026-QY26018","CLEANSTART-2026-WQ92257","DEBIAN-CVE-2026-84439","GHSA-mxvw-9w3g-hmrq","MINI-jvcg-72p3-4262","MINI-p9rc-6q36-vh92","UBUNTU-CVE-2026-84439"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_modify","security_bypass"],"network_reachable":"yes","non_default_config":true,"product_category":"Apache ZooKeeper","requires_auth":"none","summary":"Attackers can inject forged fields into ZooKeeper audit logs via unsanitized input, corrupting forensic evidence and bypassing security monitoring.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"apache","cpe":[{"product":"zookeeper","vendor":"apache"}],"cvss":{"score":5.3,"severity":"medium","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-117","name":"Improper Output Neutralization for Logs"}],"description":"When audit logging is enabled (zookeeper.audit.enable=true), an unauthenticated attacker can inject arbitrary fields into Apache ZooKeeper's audit log by sending a digest authentication request with tab characters (\\t) embedded in the username. Because the audit log uses tab-separated key=value format, the injected tabs are parsed as legitimate field separators, allowing the attacker to spoof audit results (e.g., injecting result=success), forge operation types, and corrupt forensic evidence.\n\nA log injection vulnerability in Apache ZooKeeper allows a client that can call setACL to inject forged key-value fields into zookeeper_audit.log. When audit logging is enabled, the server serializes attacker-controlled digest ACL ids into the acl= audit field without escaping tab characters. Because audit events are emitted as tab-separated key=value records, a crafted ACL id can make one successful setAcl event appear to contain forged fields such as operation=delete and znode=/forged. This undermines the integrity of downstream audit parsing, alerting, and incident response.\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 3.9.6 or 3.8.7, which fixes the issue.","ecosystems":["Bitnami"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Apache ZooKeeper: Audit log injection via unsanitized output from multiple sources","id":"CVE-2026-84439","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"other","year":"2026"},"n_packages":1,"n_references":1,"next":{"headline":"IBM Guardium Data Protection is affected by multiple vulnerabilities.","id":"CVE-2026-84440"},"packages":[{"ecosystem":"Bitnami","fixed":["3.8.7","3.9.6"],"introduced":["3.8.0","3.9.0"],"last_affected":[],"package":"zookeeper","purl":"pkg:bitnami/zookeeper","source":"BIT-zookeeper-2026-84439"}],"prev":{"headline":"OpenCart Autocomplete Workflow edit.php cross site scripting","id":"CVE-2026-84438"},"products":["Apache ZooKeeper"],"published":"2026-09-16","related":[{"cvss_score":9.1,"headline":"Apache ZooKeeper: Authentication bypass with IP-based authentication in Admin Server","id":"CVE-2024-51504","kev_date_added":null,"published":"2024-11-07"},{"cvss_score":9.1,"headline":"Apache ZooKeeper: Authorization bypass in SASL Quorum Peer Authentication","id":"CVE-2023-44981","kev_date_added":null,"published":"2023-10-11"},{"cvss_score":8.1,"headline":"Memory corruption in n/a","id":"CVE-2016-5017","kev_date_added":null,"published":"2016-09-21"},{"cvss_score":7.5,"headline":"Apache ZooKeeper: Information disclosure via SetWatches reconnect replay","id":"CVE-2026-59739","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":7.5,"headline":"Apache ZooKeeper: Improper validation of certificate with host mismatch in FIPS mode","id":"CVE-2026-59969","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":7.5,"headline":"Missing authorization in Apache ZooKeeper","id":"CVE-2026-79993","kev_date_added":null,"published":"2026-09-16"},{"cvss_score":7.5,"headline":"Missing Authorization in Apache ZooKeeper","id":"CVE-2018-8012","kev_date_added":null,"published":"2018-05-21"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-17","vendors":["Apache Software Foundation"]},"summary":"Attackers can inject forged fields into ZooKeeper audit logs via unsanitized input, corrupting forensic evidence and bypassing security monitoring.","url":"https://insights.sbomify.com/CVE-2026-84439/"}