Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-44255

CVE-2026-44255MEDIUM

Wazuh: Username Enumeration via Timing Side-Channel

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  L  N  N    5.3   .0062   47.7     —

AFFECTED
  Product  Versions              Fixed
  wazuh    >= 4.0.0, < 4.14.6 –  —

TIMELINE
  May 5   Reserved by GitHub_M
  Aug 19  Published (CNA: GitHub_M)
  Sep 18  EXPLOIT PUBLISHED — CVE-2026-44255 (wazuh). Public exploit reference added.

CWE-208 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

Wazuh is a free and open source platform used for threat prevention, detection, and response. From 4.0.0 until 4.14.6 and 5.0.0-beta2, AuthenticationManager.check_user() in framework/wazuh/rbac/orm.py performs check_password_hash() only when the supplied username exists. A nonexistent username returns immediately, while a valid username causes an expensive bcrypt calculation. An unauthenticated remote attacker can compare authentication response times to enumerate valid Wazuh usernames and use that information in subsequent credential attacks. This issue is fixed in versions 4.14.6 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 18, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-44255 (wazuh). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
wazuh	wazuh	—	>= 4.0.0, < 4.14.6	—

Weaknesses

CWE-208

References (5)

https://github.com/wazuh/wazuh/commit/5ecea7b38b998407cb0d205467dd247140a0f981 [Patch]
https://github.com/wazuh/wazuh/pull/35757 [Issue Tracking, Patch]
https://github.com/wazuh/wazuh/releases/tag/v4.14.6 [Release Notes]
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 [Release Notes]
https://github.com/wazuh/wazuh/security/advisories/GHSA-3978-44q9-9px9 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-44255 at cve.org

Vendors: wazuh

Weaknesses: CWE-208

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44255 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 Sunday, October 4, 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.