Integer overflow in Wazuh
CVE-2026-41499
Wazuh is a free and open source platform used for threat prevention, detection, and response. From version 4.0.0 to before version 4.14.4, multiple heap-based out-of-bounds WRITE vulnerabilities exist in parse_uname_string() (remoted_op.c). This function processes OS identification data from agents and contains a dangerous code pattern that appears in 4 locations within the same function: writing to strlen(ptr) - 1 without checking for empty strings. When the string is empty, strlen() returns 0, and 0 - 1 wraps to SIZE_MAX due to unsigned integer underflow. Due to pointer arithmetic wrapping, SIZE_MAX effectively becomes -1, causing a write exactly 1 byte before the allocated buffer. This corrupts heap metadata (e.g., the chunk size field in glibc malloc), leading to heap corruption. This issue has been patched in version 4.14.4.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (37.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.002
Affected products
- Wazuh — versions >= 4.0.0, < 4.14.4
Weakness classification (CWE)
References
- github.com/wazuh/wazuh/security/advisories/GHSA-qvqj-p8mm-r7h3 (Vendor Advisory)
- github.com/wazuh/wazuh/releases/tag/v4.14.4 (Release Notes)
Frequently asked questions
- What is CVE-2026-41499?
- CVE-2026-41499 is a medium-severity vulnerability in Wazuh, classified under Buffer Underwrite. CVSS score: 6.5/10. Published 2026-04-29.
- How severe is CVE-2026-41499?
- Medium severity. CVSS v3 base score is 6.5 out of 10.