CVE-2026-84501

Katalog CVE

CVSS 5.3 · Medium EPSS 0,74%

Kerentanan Improper Output Neutralization for Logs pada apache zookeeper. Skor CVSS 3.1 5.3 (Medium) menurut CISA ADP.

Deskripsi (NVD)

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 — with arbitrary timestamps, log levels, class names, and messages — that are visually indistinguishable from genuine ZooKeeper log output. This issue affects Apache ZooKeeper: from 3.9.0 through 3.9.5, from 3.8.0 through 3.8.6. Users are recommended to upgrade to version 3.8.7 or 3.9.6, which fixes the issue.

Rincian

Terbit di NVD

16 September 2026

Terakhir diubah

18 September 2026

Status NVD

Analyzed

CVSS 3.1

5.3 (Medium), sumber CISA ADP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-117: Improper Output Neutralization for Logs

EPSS (30 hari)

0,74% peluang dieksploitasi; lebih tinggi dari 53,4% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://lists.apache.org/thread/ohby1g6zjt72p0w79rhbr41nczzvr33y mailing list · advisory vendor
• http://www.openwall.com/lists/oss-security/2026/09/15/7 mailing list