EUVD-2026-12623Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
4DescriptionGitHub Advisory
Wazuh is a free and open source platform used for threat prevention, detection, and response. Starting in version 3.9.0 and prior to version 4.14.3, multiple stack-based buffer overflows exist in the Security Configuration Assessment (SCA) decoder (wazuh-analysisd). The use of sprintf with a floating-point (%lf) format specifier on a fixed-size 128-byte buffer allows a remote attacker to overflow the stack. A specially crafted JSON event can trigger this overflow, leading to a denial of service (crash) or potential RCE on the Wazuh manager. The vulnerability is located in /src/analysisd/decoders/security_configuration_assessment.c, within the FillScanInfo and FillCheckEventInfo functions. In multiple locations, a 128-byte buffer (char value[OS_SIZE_128];) is allocated on the stack to hold the string representation of a number from a JSON event. The code checks if the number is an integer or a double. If it's a double, it uses sprintf(value, "%lf", ...) to perform the conversion. This sprintf call is unbounded. If a floating-point number with a large exponent (e.g., 1.0e150) is provided, sprintf will attempt to write its full string representation (a "1" followed by 150 zeros), which is larger than the 128-byte buffer, corrupting the stack. Version 4.14.3 patches the issue.
AnalysisAI
Stack-based buffer overflow in Wazuh manager versions 3.9.0 through 4.14.3 allows remote attackers with high privileges to crash the wazuh-analysisd service via malformed JSON events, resulting in denial of service. The vulnerability stems from unsafe use of sprintf with floating-point format specifiers in the Security Configuration Assessment decoder, and may potentially enable remote code execution on affected Wazuh installations.
Technical ContextAI
A buffer overflow occurs when data written to a buffer exceeds its allocated size, potentially overwriting adjacent memory and corrupting program state. This vulnerability is classified as Stack-based Buffer Overflow (CWE-121).
RemediationAI
Use memory-safe languages or bounds-checked functions. Enable ASLR, DEP/NX, and stack canaries. Apply vendor patches promptly.
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Denial Of Service
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External POC / Exploit Code
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