Integer overflow in Wazuh
CVE-2026-26204
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 1.0.0 to before version 4.14.4, a heap-based out-of-bounds WRITE occurs in GetAlertData, resulting in writing a NULL byte exactly 1 byte before the start of the buffer allocated by strdup. Due to unsigned integer underflow and pointer arithmetic wrapping, the write lands at offset -1 from the buffer, corrupting heap metadata. A malicious actor can potentially leverage this issue through a compromised agent to cause denial of service or heap corruption by injecting a specially crafted alert into the alerts log file monitored by wazuh-logcollector. This issue has been patched in version 4.14.4.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (6.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Wazuh — versions >= 1.0.0, < 4.14.4
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-j4c7-hwjw-8857 (Exploit, Vendor Advisory)
- github.com/wazuh/wazuh/releases/tag/v4.14.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-26204?
- CVE-2026-26204 is a medium-severity vulnerability in Wazuh, classified under Buffer Underwrite. CVSS score: 4.4/10. Published 2026-04-29.
- How severe is CVE-2026-26204?
- Medium severity. CVSS v3 base score is 4.4 out of 10.