Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44253

CVE-2026-44253MEDIUM

Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   H   N  U  N  N  H    4.9   .0061   47.4     —

AFFECTED
  Product  Versions              Fixed
  wazuh    >= 3.9.0, < 4.14.5 –  —

TIMELINE
  May 5   Reserved by GitHub_M
  Aug 19  Published (CNA: GitHub_M)
  Sep 22  EXPLOIT PUBLISHED — CVE-2026-44253 (wazuh). Public exploit reference added.

CWE-770, CWE-789 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 3.9.0 until 4.14.5 and 5.0.0-beta2, the Wazuh cluster protocol in framework/wazuh/core/cluster/common.py allows an authenticated cluster node to exhaust memory on the master. The receive_str() method accepts an attacker-controlled total for InBuffer without a maximum, so a new_str command can request a multi-gigabyte bytearray and repeated requests accumulate in in_str. The divided-message path also retains flag_divided fragments under unique counters in div_msg_box without a count, aggregate-size, or expiration limit. Exploitation can disrupt agent connectivity and alert processing across the monitored environment. This issue is fixed in versions 4.14.5 and 5.0.0-beta2.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
May 5, 2026	Reserved	Reserved by GitHub_M
August 19, 2026	Published	Published (CNA: GitHub_M)
September 22, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44253 (wazuh). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
wazuh	wazuh	—	>= 3.9.0, < 4.14.5	—

Weaknesses

CWE-770 · CWE-789

References (4)

https://github.com/wazuh/wazuh/commit/d29c5c89a0e16477545ca27f4e06229021e3183c [Patch]
https://github.com/wazuh/wazuh/pull/35173 [Issue Tracking, Patch]
https://github.com/wazuh/wazuh/releases/tag/v4.14.5 [Patch, Release Notes]
https://github.com/wazuh/wazuh/security/advisories/GHSA-h5r8-gvhv-cmp2 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-44253 at cve.org

Vendors: wazuh

Weaknesses: CWE-770 · CWE-789

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44253 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.