CVE-2026-48354 Overview
CVE-2026-48354 is an integer overflow vulnerability [CWE-190] in Adobe's Content Authenticity Initiative (CAI) Content Credentials software. The flaw affects the c2pa Rust library, c2pa-web Node.js package, and the c2patool command-line utility. An attacker who supplies a crafted asset to a vulnerable parser can trigger an integer wraparound that crashes the application. Exploitation requires no user interaction and no authentication. The impact is limited to availability, resulting in a denial-of-service condition. Because the C2PA libraries are embedded across creative and media pipelines on Windows, macOS, Linux, iOS, and Android, downstream applications inherit the exposure.
Critical Impact
A local attacker can trigger an integer overflow in C2PA parsing code to crash any application that embeds the affected libraries, disrupting content authenticity verification workflows.
Affected Products
- Adobe c2pa (Rust crate)
- Adobe c2pa-web (Node.js package)
- Adobe c2patool (command-line utility)
Discovery Timeline
- 2026-07-14 - CVE-2026-48354 published to the National Vulnerability Database
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-48354
Vulnerability Analysis
The vulnerability resides in the parsing logic of the C2PA Content Credentials libraries. When processing an asset containing C2PA manifest data, the code performs arithmetic on size or offset fields sourced from attacker-controlled input. The computation wraps around the integer boundary, yielding a value that violates downstream assumptions. The resulting undefined state causes the process to abort or dereference invalid memory, terminating the host application. Because C2PA verification runs automatically on file open in many creative applications and web services, exposure extends to any pipeline that ingests untrusted media containing manifest data.
Root Cause
The defect is an integer overflow or wraparound [CWE-190] in size or length arithmetic used during manifest deserialization. The affected code paths do not use checked arithmetic primitives such as Rust's checked_add or checked_mul when computing buffer boundaries from manifest metadata. Adobe has not published the specific function or module in the public advisory.
Attack Vector
The attack vector is local, meaning the attacker must supply a crafted file that the victim application processes. No privileges or user interaction beyond routine file handling are required. Delivery paths include email attachments, downloaded images, or files ingested by automated media processing services that embed c2pa, c2pa-web, or c2patool.
No verified public proof-of-concept exists for CVE-2026-48354. Refer to the Adobe Security Advisory APSB26-80 for technical details.
Detection Methods for CVE-2026-48354
Indicators of Compromise
- Repeated crashes or abnormal terminations of applications that embed the C2PA libraries when processing image, audio, or video assets.
- Windows Error Reporting, macOS ReportCrash, or Linux coredumpctl entries referencing c2patool or processes linked against c2pa or c2pa-web.
- Unexpected process exits in server-side media validation workers after ingesting externally sourced files.
Detection Strategies
- Inventory endpoints and build systems for the presence of c2pa, c2pa-web, and c2patool using software composition analysis and endpoint telemetry.
- Alert on repeated non-zero exit codes or fatal signals from processes that invoke C2PA verification during batch media processing.
- Correlate crash telemetry with file ingestion events to identify potentially malicious assets triggering the overflow.
Monitoring Recommendations
- Ship application crash logs and process termination events to a centralized SIEM for pattern analysis.
- Monitor content authenticity verification services for elevated error rates or availability drops.
- Track network sources of media files that immediately precede C2PA parser crashes to identify attacker infrastructure.
How to Mitigate CVE-2026-48354
Immediate Actions Required
- Apply the fixed versions of c2pa, c2pa-web, and c2patool as published in Adobe Security Advisory APSB26-80.
- Rebuild and redeploy any downstream applications, container images, or Node.js services that statically bundle the affected libraries.
- Restrict C2PA verification workflows to trusted media sources until patched builds are deployed.
Patch Information
Adobe published fixed versions in Adobe Security Advisory APSB26-80. Consult the advisory for the specific fixed version numbers for each affected component and update dependency manifests such as Cargo.toml and package.json accordingly.
Workarounds
- Disable automatic C2PA manifest parsing in applications that expose a configuration option to do so.
- Sandbox or containerize processes that invoke c2patool on untrusted files so crashes do not affect the host service.
- Implement upstream file validation to reject malformed C2PA structures before they reach the vulnerable parser.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
