CVE-2026-48296 Overview
CVE-2026-48296 is an Integer Underflow (Wrap or Wraparound) vulnerability [CWE-191] affecting Adobe's Content Authenticity Initiative (CAI) Content Credentials libraries. The flaw impacts the c2pa Rust library, c2pa-web Node.js package, and the c2patool command-line utility. An attacker can trigger the underflow through crafted input, causing the application to crash. Exploitation results in a denial-of-service condition and does not require user interaction. The vulnerability is triggered locally through malicious C2PA-formatted content processed by the affected libraries.
Critical Impact
A local attacker can crash any application that consumes untrusted media through the CAI Content Credentials SDK, disrupting content provenance verification workflows across desktop, mobile, and server environments.
Affected Products
- Adobe c2pa (Rust library)
- Adobe c2pa-web (Node.js package)
- Adobe c2patool (command-line utility)
Discovery Timeline
- 2026-07-14 - CVE-2026-48296 published to NVD
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-48296
Vulnerability Analysis
The vulnerability resides in the C2PA (Coalition for Content Provenance and Authenticity) parsing routines used by Adobe's Content Authenticity SDK. When the library processes a crafted manifest or asset, an arithmetic operation on an unsigned integer produces a value below zero, wrapping around to a large positive value. The corrupted value is then used in subsequent length, offset, or allocation calculations, leading to abnormal control flow and process termination.
Because the affected libraries are embedded in applications that verify or generate content credentials, a single malformed file can terminate the host process. The impact is limited to availability, with no confidentiality or integrity consequences.
Root Cause
The root cause is missing validation of size or offset fields prior to arithmetic operations within the C2PA manifest parser. Subtraction on unsigned values without bounds checks wraps to SIZE_MAX-adjacent values, breaking downstream logic and triggering unrecoverable errors [CWE-191].
Attack Vector
The attack requires local delivery of a crafted C2PA-signed asset (image, video, or audio container with manifest metadata) to a process that invokes c2pa, c2pa-web, or c2patool. Automated pipelines that scan user-uploaded content for provenance data are the highest-risk consumers. No authentication or user interaction is required to trigger the crash once the file is processed.
No public proof-of-concept exploit is currently available for CVE-2026-48296.
Detection Methods for CVE-2026-48296
Indicators of Compromise
- Unexpected termination or crash of processes linking the c2pa, c2pa-web, or c2patool libraries.
- Repeated failed manifest-parsing events in application logs shortly before process exit.
- Malformed C2PA-signed assets appearing in upload directories or ingestion queues.
Detection Strategies
- Instrument applications that consume the CAI SDK with crash reporting and correlate process exits with the input file being processed.
- Monitor endpoint logs for repeated invocations of c2patool that terminate abnormally with non-zero exit codes.
- Inspect C2PA manifest length and offset fields at the ingestion boundary and reject values that fail sanity checks.
Monitoring Recommendations
- Enable verbose logging in c2patool and forward stderr output to a centralized log platform for review.
- Track version metadata of deployed c2pa and c2pa-web packages across the fleet to identify unpatched instances.
- Alert on abnormal restart patterns for services that process user-supplied media through the CAI SDK.
How to Mitigate CVE-2026-48296
Immediate Actions Required
- Inventory all applications, scripts, and services that depend on c2pa, c2pa-web, or c2patool across Windows, macOS, Linux, iOS, and Android deployments.
- Apply the fixed versions published in Adobe Security Advisory APSB26-80 as soon as they are available in your environment.
- Restrict processing of C2PA content to trusted sources until patched builds are deployed.
Patch Information
Adobe has published remediation guidance in Adobe Security Advisory APSB26-80. Update the c2pa Rust crate, the c2pa-web Node.js package, and the c2patool binary to the versions listed in the advisory. Rebuild and redeploy any downstream applications that statically link the affected libraries.
Workarounds
- Sandbox or isolate processes that invoke the CAI SDK so a crash does not disrupt the parent application.
- Pre-validate uploaded assets with a lightweight schema check before passing them to the C2PA parser.
- Implement automatic service restart with rate limiting to reduce the availability impact of repeated exploitation attempts.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
