Content Credentials SDK EUVD-2026-56558

The attack vector is local (AV:L): a crafted content credential payload must be supplied to and processed by an application using the vulnerable SDK or CLI tool on the target host. No special privileges are required (PR:N) and no user interaction is needed beyond the normal operation of the file-processing application (UI:N). The primary limiting factor is local file access - an attacker must be able to introduce a maliciously crafted C2PA-formatted media file into the processing path of the vulnerable application. In automated or server-side pipeline deployments (e.g., batch content verification, CI/CD asset pipelines), this condition may be reachable without direct interactive access if the pipeline ingests files from external or untrusted sources. Exploitation is limited to denial-of-service (application crash); there is no confirmed path to code execution or data exfiltration from this vulnerability.

The CVSS 3.1 base score of 6.2 with vector AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H accurately captures the constrained but straightforward nature of this flaw. The local attack vector (AV:L) is the primary limiting factor - direct remote network exploitation is not possible; an attacker must be able to supply a malformed content credential asset to an application that processes it locally. However, PR:N (no privileges required) combined with UI:N (no user interaction) is significant in automated pipeline deployments where the SDK silently ingests files without a human in the loop. There is no confidentiality or integrity impact, limiting real-world blast radius to service disruption. No EPSS data was provided and no KEV listing exists, suggesting this is not currently under active exploitation. This vulnerability is a real but bounded operational risk - it is not a remote code execution issue and does not cross a scope boundary, making it a lower priority than its availability impact alone might suggest, except for organizations running unattended c2pa processing pipelines.

An attacker crafts a media file containing a malformed C2PA content credential manifest in which a length or count field is set to zero or a minimum-boundary value, causing the SDK's integer arithmetic to underflow during parsing. When this file is ingested by an automated content verification pipeline - such as a news organization's asset management system or a publishing platform - the underflow triggers a crash, taking down the processing service. No public proof-of-concept has been identified at time of analysis.