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-2026-45798

CVE-2026-45798HIGH

Wazuh: Pre-auth stack-buffer-overflow in compare_wazuh_versions reachable from wazuh-authd (TCP/1515) via crafted enrollment V: field

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0092   58.8     —

AFFECTED
  Product  Versions              Fixed
  wazuh    >= 4.5.0, < 4.14.6 –  —

TIMELINE
  May 13  Reserved by GitHub_M
  Aug 19  Published (CNA: GitHub_M)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-45798 (wazuh). Public exploit reference added.

CWE-121, CWE-170 · 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 4.5.0 until 4.14.6 and 5.0.0-beta2, compare_wazuh_versions() in src/shared/version_op.c copies the attacker-controlled enrollment V: field into a 10-byte stack buffer with strncpy() but does not explicitly terminate the buffer. The function is reachable before authentication through wazuh-authd on TCP port 1515 when anonymous TLS enrollment is enabled. A version string of at least nine non-null bytes can cause strchr() and strtok() to read beyond ver2 and can make strtok() write a null byte into adjacent stack memory, allowing a remote denial of service. 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 13, 2026	Reserved	Reserved by GitHub_M
August 19, 2026	Published	Published (CNA: GitHub_M)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-45798 (wazuh). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
wazuh	wazuh	—	>= 4.5.0, < 4.14.6	—

Weaknesses

CWE-121 · CWE-170

References (5)

https://github.com/wazuh/wazuh/commit/b6aac379982d6144b8da38450cbea6c8dc15be44 [Patch]
https://github.com/wazuh/wazuh/pull/36059 [Issue Tracking, Patch]
https://github.com/wazuh/wazuh/releases/tag/v4.14.6 [Patch, Release Notes]
https://github.com/wazuh/wazuh/releases/tag/v5.0.0-beta2 [Patch, Release Notes]
https://github.com/wazuh/wazuh/security/advisories/GHSA-4fvp-jfc3-qr6r [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-45798 at cve.org

Vendors: wazuh

Weaknesses: CWE-121 · CWE-170

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45798 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.