CVE-2026-48435: CAI Content Credentials DoS Vulnerability

CVE-2026-48435 Overview

CVE-2026-48435 is an integer underflow vulnerability [CWE-191] in Adobe CAI (Content Authenticity Initiative) Content Credentials. The flaw causes an arithmetic wraparound during value processing, corrupting internal state and crashing the affected application. Successful exploitation results in a denial-of-service condition against the local process.

The issue requires local access and does not require privileges or user interaction. Confidentiality and integrity are not affected, but availability impact is high. Adobe published details in the Adobe Security Advisory APSB26-111.

Critical Impact
An unauthenticated local attacker can trigger an integer underflow in CAI Content Credentials to crash the application and produce a denial-of-service condition without user interaction.

Affected Products

Adobe CAI Content Credentials SDK (see Adobe Security Advisory APSB26-111 for specific versions)
Applications embedding the CAI Content Credentials SDK
Downstream tools consuming Content Credentials manifests through the SDK

Discovery Timeline

2026-08-11 - CVE-2026-48435 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-48435

Vulnerability Analysis

The defect resides in numeric handling within CAI Content Credentials, where an unsigned arithmetic operation wraps around when a value falls below zero. The resulting wraparound produces an unexpectedly large value that drives subsequent memory or loop operations. This mismatch between intended and actual values corrupts execution state and terminates the process.

An attacker supplies crafted input that reaches the affected numeric path. Because the impact is limited to availability, the outcome is a crash rather than code execution or data disclosure. Repeated exploitation prevents legitimate use of applications that depend on the SDK for content authenticity verification.

Root Cause

The root cause is an integer underflow (wrap or wraparound) classified as [CWE-191]. Code paths subtract from or decrement a value without validating that the operand is within a safe range. When the operation underflows, the value silently wraps, and downstream logic proceeds on a corrupted premise. Missing bounds checks and unsafe unsigned arithmetic are the underlying coding weaknesses.

Attack Vector

The attack vector is local. An attacker with the ability to feed input to a CAI Content Credentials workflow, such as a malformed manifest or an asset with malicious metadata, triggers the underflow. Privileges are not required, and no user interaction is needed once the input reaches the vulnerable parser. See the Adobe Security Advisory APSB26-111 for technical details.

// No verified proof-of-concept code is publicly available.
// Refer to Adobe Security Advisory APSB26-111 for technical details.

Detection Methods for CVE-2026-48435

Indicators of Compromise

Unexpected termination of processes that load the CAI Content Credentials SDK, particularly following ingestion of external assets or manifests.
Application crash dumps referencing Content Credentials parsing routines or arithmetic faults.
Repeated processing failures tied to the same asset file, manifest, or input source.

Detection Strategies

Monitor host telemetry for repeated crashes of applications embedding the Content Credentials SDK and correlate with recently opened files.
Alert on abnormal exit codes or fault signatures produced by media-handling processes after opening third-party content.
Track version inventories to identify hosts still running unpatched CAI Content Credentials components.

Monitoring Recommendations

Collect and centralize application crash and Windows Error Reporting or macOS ReportCrash artifacts for content processing tools.
Baseline normal parser exit behavior so denial-of-service attempts stand out from routine handling errors.
Review file provenance for assets that trigger crashes and quarantine sources that produce repeat failures.

How to Mitigate CVE-2026-48435

Immediate Actions Required

Apply the patched version of CAI Content Credentials as described in Adobe Security Advisory APSB26-111.
Inventory applications and pipelines that embed the CAI Content Credentials SDK and prioritize those handling untrusted content.
Restrict processing of Content Credentials manifests from untrusted sources until updates are deployed.

Patch Information

Adobe has released fixed builds through the Content Authenticity SDK update track documented in Adobe Security Advisory APSB26-111. Update all consuming applications to the vendor-specified fixed version and rebuild any downstream software that statically links the SDK.

Workarounds

Limit exposure of the affected components to trusted, validated input sources only.
Run content ingestion workflows in isolated processes so a crash does not affect broader services.
Add file-type and source filtering upstream of the SDK to reject unexpected or malformed manifests.

bash

# Example: isolate CAI Content Credentials processing in a restricted service account
# and automatically restart the worker on crash to reduce DoS dwell time
systemctl edit cai-content-worker
# In the override:
# [Service]
# Restart=on-failure
# RestartSec=5s
# User=cai-restricted