CVE-2026-76189 in C2PA Tool
Summary
by MITRE • 08/25/2026
CAI Content Credentials is 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.
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Analysis
by VulDB Data Team • 08/25/2026
The CAI Content Credentials library is susceptible to an integer underflow vulnerability classified as CWE-192, which occurs when arithmetic operations result in a value that falls below the minimum limit for the data type used. This specific flaw manifests during the processing of input parameters where subtraction or decrementing logic fails to properly validate bounds before execution. When an attacker provides crafted input designed to trigger this underflow condition, the resulting negative integer can propagate through subsequent logical checks or array indexing operations within the application's core functionality. Because the vulnerability resides in a fundamental component responsible for handling content credentials, it affects the integrity and availability of services relying on accurate credential validation and metadata processing.
The operational impact of exploiting this integer underflow is primarily centered around service disruption rather than unauthorized data access or code execution. As the erroneous negative value influences control flow decisions or memory allocation routines, it can cause the application to enter an invalid state that triggers a crash exception. This leads directly to a denial-of-service condition where the affected process terminates unexpectedly and requires manual restart or recovery procedures. The severity of this impact is compounded by the fact that exploitation does not require user interaction, meaning remote attackers can trigger the vulnerability through automated requests without needing social engineering tactics or specific user actions such as clicking links or uploading files manually.
From a threat intelligence perspective, this vulnerability aligns with ATT&CK technique T1499, Endpoint Denial of Service, specifically under sub-techniques involving resource exhaustion via application crashes. The lack of required user interaction significantly increases the attack surface, allowing for potential automated scanning and exploitation campaigns across networks where CAI Content Credentials are deployed as part of larger content management or verification pipelines. Attackers can leverage this flaw to degrade system reliability, increase operational costs through frequent restarts, and potentially mask other malicious activities by causing noise in security logs due to repeated service interruptions.
Mitigation strategies should focus on immediate patching using the latest version of CAI Content Credentials that includes bounds checking for all integer arithmetic operations involving external inputs. Developers must implement strict validation logic to ensure that values remain within expected positive ranges before being used in critical calculations or memory allocations. Additionally, integrating fuzz testing into the continuous integration pipeline can help identify similar edge cases early in development. For systems currently exposed to risk, deploying web application firewalls with rules capable of detecting anomalous integer parameter patterns may provide a temporary layer of defense until permanent code fixes are applied and deployed across all affected environments.