CVE-2026-44253

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Source
https://cve.org/CVERecord?id=CVE-2026-44253
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44253.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-44253
Aliases
  • GHSA-h5r8-gvhv-cmp2
Published
2026-08-19T16:06:06Z
Modified
2026-09-11T03:30:57Z
Severity
  • 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
Wazuh: Cluster Protocol Memory Exhaustion (DoS) via unbounded receive_str allocation and div_msg_box accumulation
Details

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.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-770",
        "CWE-789"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44253.json"
}
References

Affected packages

Git / github.com/wazuh/wazuh

Affected ranges

Type
GIT
Repo
https://github.com/wazuh/wazuh
Events
Introduced
18bac2de69f5a37e5c3c4e2dfbce5a0093042ea7
Introduced
cddd833300cb5af494ba7dab31192bae649eb184
Fixed
460511d384aadc1d539caa6c4aa6a4234d68c9ba
Fixed
b58b3b2552497639b1b2a2b23e8de87e4ce9cf02
Fixed
d29c5c89a0e16477545ca27f4e06229021e3183c
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "3.9.0"
        },
        {
            "fixed": "4.14.5"
        },
        {
            "introduced": "5.0.0-beta1"
        },
        {
            "fixed": "5.0.0-beta2"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

v5.*
v5.0.0-beta1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44253.json"