CVE-2026-71540

highpriority · track · 0EPSS 0.004 · 37 %ileDERU
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.43% (37th) EPSS
CVSS 7.5 · high
Is it mine?
3 products
Check your exposure
Who says so?
2 sources
fstec_bdu · cert_bund

EPSS · scored 2026-10-27

Wazuh is an open-source security platform providing unified XDR and SIEM protection for endpoints and cloud workloads. From 3.9.0 until 4.14.7, wazuh-clusterd in framework/wazuh/core/cluster/common.py allocates a payload buffer using the size declared in a 20-byte cluster protocol header before Fernet decryption validates the peer. An unauthenticated network peer can declare a payload of up to 256 MiB, stop sending after the header, and retain that allocation until the TCP connection closes. The cluster listener has no application-level per-source connection budget in affected versions, allowing concurrent sockets to multiply memory consumption and potentially terminate the cluster process, disrupt synchronization, and interrupt distributed API forwarding. This issue is fixed in version 4.14.7.

01

cvss

Technical severity, 0–10. One row per scoring source.

7.5
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.9–7.5

v3.17.5highAV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · FSTEC (BDU) RU
v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 3.9 · impact 3.6
v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)
02

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770US
04

affected products (3)

Products and version ranges known to be affected.

05

advisories (1)

Vendor and ecosystem advisories describing this.

  • WID-SEC-W-2026-2883Wazuh: Mehrere SchwachstellenDeutsch2026-08-17csaf · cert_bundDE

    Ein Angreifer kann mehrere Schwachstellen in Wazuh ausnutzen, um Dateien zu manipulieren, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um einen SQL-Injection Angriff durchzuführen, und um beliebigen Programmcode auszuführen.

06

also known as (1)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

fstec_bducert_bundNVDCVE.orgMITRE
published 2026-09-24modified 2026-10-01
08

references (4) nvd

External citations — patches, advisories, analysis.

scry

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