CVE-2026-71389 Overview
CVE-2026-71389 is an integer underflow vulnerability [CWE-191] affecting Adobe's CAI (Content Authenticity Initiative) Content Credentials. An attacker with local access can trigger a wrap-around condition that crashes the application, producing a denial-of-service state. Exploitation does not require user interaction or authentication on the target process.
Adobe published advisory APSB26-111 describing the flaw. The issue was published to the National Vulnerability Database on 2026-08-11 and last modified on 2026-08-12. The EPSS probability is 0.153% as of 2026-08-13, indicating low observed exploitation likelihood.
Critical Impact
A local attacker can crash CAI Content Credentials by supplying crafted input that triggers an integer underflow, disrupting availability of content provenance verification workflows.
Affected Products
- Adobe CAI Content Credentials (see Adobe advisory APSB26-111 for specific affected builds)
- Applications embedding the Content Authenticity SDK
- Workflows dependent on Content Credentials for media provenance
Discovery Timeline
- 2026-08-11 - CVE-2026-71389 published to NVD
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-71389
Vulnerability Analysis
The vulnerability is classified under [CWE-191] Integer Underflow (Wrap or Wraparound). An arithmetic operation on an unsigned integer produces a result below the minimum representable value, wrapping to a very large positive value. When this wrapped value is used in subsequent length, offset, or allocation calculations, the application performs unsafe memory operations that terminate the process.
Because the CVSS vector indicates no impact on confidentiality or integrity, exploitation results only in availability loss. The affected process crashes, and any pipeline validating Content Credentials halts until the process is restarted.
Root Cause
The root cause is unchecked arithmetic within the Content Credentials parsing or manifest-handling logic. Adobe's advisory attributes the flaw to an integer underflow that leads to an application crash. A malformed manifest, asset field, or size value likely drives a subtraction operation past zero, corrupting downstream computations.
Attack Vector
The attack vector is local (AV:L). An attacker supplies a crafted file or input that CAI Content Credentials processes. No privileges (PR:N) and no user interaction (UI:N) are required by the vulnerable component itself. The attacker must be able to deliver the malformed asset to the local processing path, for example through a shared file, a scripted pipeline job, or an automated ingest workflow. Successful exploitation crashes the application. No verified public exploit code is available. Refer to the Adobe Security Advisory APSB26-111 for technical details.
Detection Methods for CVE-2026-71389
Indicators of Compromise
- Unexpected termination or crash dumps generated by the CAI Content Credentials process or SDK host application
- Repeated ingestion failures tied to a specific asset or manifest file
- Anomalous file inputs containing malformed size fields or truncated Content Credentials manifests
Detection Strategies
- Monitor for abnormal exit codes and crash telemetry from processes hosting the Content Authenticity SDK
- Correlate application crashes with the specific asset file processed immediately prior to termination
- Alert on repeated crash-loop patterns in automated media processing pipelines
Monitoring Recommendations
- Forward application crash reports and Windows Error Reporting or macOS ReportCrash output to a centralized log store for review
- Track process lifetime and restart frequency for services embedding the Content Credentials SDK
- Retain suspect asset files for offline analysis when a crash correlates to a specific input
How to Mitigate CVE-2026-71389
Immediate Actions Required
- Apply the update referenced in Adobe Security Advisory APSB26-111 to all systems running CAI Content Credentials or the Content Authenticity SDK
- Inventory applications and pipelines that embed the SDK and confirm patched versions are deployed
- Restrict which users and automated jobs can submit asset files to systems running Content Credentials processing
Patch Information
Adobe has published fixed versions in advisory APSB26-111. Administrators should consult the Adobe Security Advisory APSB26-111 for the specific fixed builds and update procedures for both standalone applications and SDK-embedding software.
Workarounds
- Isolate Content Credentials processing to sandboxed workers that can restart cleanly if crashed
- Validate incoming asset files against expected size and structural constraints before passing them to the SDK
- Limit local access to systems performing Content Credentials verification until patches are applied
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
