CVE-2026-34667

Description

CAI Content Credentials versions 0.78.2, 0.7.0 and earlier are affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of this issue does not require user interaction.

CVSS Details

CVSS Score

6.2

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

CAI Content Credentials <= 0.78.2

CAI Content Credentials <= 0.7.0

PoC / Exploit Code

⚠ For Security Research Only

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

python

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

// Simulated vulnerable function in CAI Content Credentials
void process_credential_size(uint32_t input_size) {
    printf("[+] Processing input size: %u\n", input_size);

    // Vulnerability: Integer Underflow
    // If input_size is 0, (0 - 1) wraps around to UINT_MAX (4294967295)
    uint32_t buffer_size = input_size - 1;

    printf("[+] Calculated buffer size after subtraction: %u\n", buffer_size);

    // Attempt to allocate memory based on wrapped value
    // This will likely fail (malloc returns NULL) or cause system instability
    char *buffer = (char *)malloc(buffer_size);

    if (buffer == NULL) {
        printf("[-] Memory allocation failed. Application may crash or hang.\n");
        return;
    }

    // If allocation succeeds (unlikely for huge size), filling it causes DoS
    printf("[+] Memory allocated. Writing data...\n");
    memset(buffer, 0x41, buffer_size); 
    free(buffer);
}

int main() {
    // PoC: Triggering the underflow with 0
    printf("--- CVE-2026-34667 PoC Demo ---\n");
    process_credential_size(0);
    return 0;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34667
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34667
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34667/
[4] VulDB https://vuldb.com/cve/CVE-2026-34667
[5] https://helpx.adobe.com/security/products/content-authenticity-sdk/apsb26-53.html

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-34667", "sourceIdentifier": "[email protected]", "published": "2026-05-12T20:16:37.250", "lastModified": "2026-05-13T14:49:11.830", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "CAI Content Credentials versions 0.78.2, 0.7.0 and earlier are affected by an Integer Underflow (Wrap or Wraparound) vulnerability that could result in an application denial-of-service. An attacker could exploit this vulnerability to crash the application, leading to a denial-of-service condition. Exploitation of this issue does not require user interaction."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 6.2, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-191"}]}], "references": [{"url": "https://helpx.adobe.com/security/products/content-authenticity-sdk/apsb26-53.html", "source": "[email protected]"}]}}