CVE•Published 2026-03-07•Modified 2026-07-15•0 articles on news•5 live references•NVD data

CVE-2026-24281Apache · Zookeeper

Vulnerability data via NVD (ingested)

CVSS v3.1

7.4

HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS percentile

Exploit Prediction Scoring System · top 54% of all CVEs

Weaknesses (CWE)

CWE-295Improper Certificate Validation CWE-350Reliance on Reverse DNS Resolution for a Security-Critical Action

Description

Hostname verification in Apache ZooKeeper ZKTrustManager falls back to reverse DNS (PTR) when IP SAN validation fails, allowing attackers who control or spoof PTR records to impersonate ZooKeeper servers or clients with a valid certificate for the PTR name. It's important to note that attacker must present a certificate which is trusted by ZKTrustManager which makes the attack vector harder to exploit. Users are recommended to upgrade to version 3.8.6 or 3.9.5, which fixes this issue by introducing a new configuration option to disable reverse DNS lookup in client and quorum protocols.

Timeline

Published 2026-03-07

Modified 2026-07-15

External references

NVD MITRE Exploit-DB GitHub PoC VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-24281

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Apache Zookeeper"

All exposed Apache Zookeeper instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Zookeeper"

HTTP body or banner mentions "Zookeeper" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-24281