CVE-2026-48353: Adobe C2pa Information Disclosure Flaw

CVE-2026-48353 Overview

CVE-2026-48353 is an Improper Input Validation vulnerability [CWE-20] affecting Adobe's Content Authenticity Initiative (CAI) Content Credentials SDK and related tooling. An attacker can craft a malicious file that, when opened by a victim, causes the parser to read arbitrary files from the local file system outside the intended access scope. The flaw impacts the c2pa Rust SDK, the c2pa-web Node.js package, and the c2patool command-line utility across Windows, macOS, Linux, iOS, and Android platforms. Successful exploitation exposes sensitive files and directories to the attacker.

Critical Impact
A local attacker who convinces a user to open a malicious C2PA-signed asset can read arbitrary files accessible to the process, resulting in disclosure of sensitive data.

Affected Products

Adobe c2pa (Rust SDK)
Adobe c2pa-web (Node.js package)
Adobe c2patool (command-line utility)
Apple iOS, Apple macOS, Google Android, Linux kernel, and Microsoft Windows platforms running affected SDK versions

Discovery Timeline

2026-07-14 - CVE CVE-2026-48353 published to NVD
2026-07-16 - Last updated in NVD database

Technical Details for CVE-2026-48353

Vulnerability Analysis

The vulnerability resides in the C2PA (Coalition for Content Provenance and Authenticity) parsing logic that processes Content Credentials embedded in media assets. When the SDK ingests a crafted file, insufficient validation of file path or resource reference fields allows the parser to resolve and read local file system paths supplied by the attacker. The exploitation path requires local access and user interaction: the victim must open the malicious file with an application that uses the affected SDK. Confidentiality impact is high because the attacker can obtain the contents of arbitrary files. Integrity and availability are not affected by this issue.

Root Cause

The root cause is improper input validation [CWE-20] of untrusted references contained within C2PA manifests processed by c2pa, c2pa-web, and c2patool. The parser does not sufficiently constrain path or URI inputs to the intended resource scope, allowing the reference to traverse or point to unrelated file system locations. Adobe describes the outcome in Security Bulletin APSB26-80 as an arbitrary file system read.

Attack Vector

Exploitation requires an attacker to deliver a specially crafted C2PA asset, such as an image or media file carrying a manifest, to a victim. The victim opens the file with an application built on the affected SDK or invokes c2patool against it. The parser then dereferences the attacker-controlled path and returns file contents to the attacker-controlled manifest context. No network access or elevated privileges are required, but user interaction is mandatory.

No verified proof-of-concept code is public. See the Adobe Security Advisory APSB26-80 for technical details.

Detection Methods for CVE-2026-48353

Indicators of Compromise

Unexpected file read operations by processes hosting the c2pa, c2pa-web, or c2patool libraries, particularly access to files outside the working directory or user document paths.
C2PA manifest fields containing suspicious path references such as absolute paths, .. traversal sequences, or file:// URIs pointing to sensitive locations.
Presence of untrusted media assets processed by build pipelines, editorial tooling, or authenticity verification services.

Detection Strategies

Inspect C2PA manifests before ingestion and flag any resource references that resolve to absolute paths, parent directories, or non-media file extensions.
Enable file access auditing for processes invoking c2patool and correlate reads outside the expected asset directory.
Search endpoint telemetry for c2patool executions with attacker-supplied inputs originating from downloads, email attachments, or removable media.

Monitoring Recommendations

Log all invocations of c2patool including command-line arguments and file paths accessed during execution.
Monitor Node.js applications embedding c2pa-web for anomalous fs.readFile calls triggered during manifest processing.
Alert on cross-directory read patterns from applications that normally access only user media folders.

How to Mitigate CVE-2026-48353

Immediate Actions Required

Update c2pa, c2pa-web, and c2patool to the fixed versions listed in Adobe Security Advisory APSB26-80.
Audit build pipelines and content workflows to inventory every service that ingests C2PA-signed assets.
Restrict processing of untrusted C2PA assets to sandboxed environments until patches are applied.

Patch Information

Adobe has released fixed versions of the Content Credentials SDK and tooling. Refer to Adobe Security Advisory APSB26-80 for version-specific patch details and download locations for the Rust SDK, Node.js package, and c2patool binary.

Workarounds

Do not open C2PA-signed files received from untrusted sources until the SDK is updated.
Run c2patool and applications embedding the SDK under least-privilege accounts that cannot access sensitive files.
Apply file system access controls or mandatory access control profiles (AppArmor, SELinux, sandbox-exec) to restrict the process to a dedicated asset directory.

bash

# Example: run c2patool inside a restricted directory with a dedicated user
sudo -u c2pa-sandbox \
  bwrap --ro-bind /usr /usr \
        --bind /var/c2pa/input /work \
        --chdir /work \
        c2patool ./asset.jpg