CVE-2026-34711: CAI Content Credentials Integer Overflow Denial-of-Service Vulnerability

Technical summary

CVE-2026-34711 is an integer overflow vulnerability (CWE-190) in the CAI Content Credentials (c2pa) libraries. When processing input data, the vulnerable code fails to properly validate integer boundaries, allowing an attacker to cause an integer wraparound. This condition leads to unexpected memory allocation or buffer handling, ultimately crashing the affected application. The vulnerability has a CVSS v3.1 score of 7.5 (HIGH) with a network attack vector, requiring no authentication or user interaction.

Business impact

Organizations deploying CAI Content Credentials for content authentication face service disruption risk. Attackers can remotely trigger denial-of-service conditions without authentication, impacting availability of applications that verify media authenticity. This is particularly concerning for media organizations, publishers, and platforms that rely on c2pa for content provenance verification, as sustained attacks could degrade or disable authentication workflows.

Affected systems

The vulnerability affects c2pa-web version 0.7.1 and earlier, and c2pa version 0.80.1 and earlier. Impacted platforms include Adobe's c2pa implementations, Apple iOS and macOS, Google Android, Microsoft Windows, and Linux systems running vulnerable versions of these libraries. Any application or service integrating these libraries is potentially vulnerable if not updated.

Exploitability

Exploitation is straightforward and requires only network access—no authentication, user interaction, or special privileges are needed. An attacker can craft and send malicious input remotely to trigger the integer overflow and crash the target application. The low attack complexity and lack of prerequisites make this vulnerability relatively easy to exploit at scale, making immediate patching important.

Remediation

Update CAI Content Credentials libraries to patched versions released after the modification date of June 17, 2026. Verify the specific patch version numbers in the official Adobe, Apple, Google, Microsoft, and Linux vendor advisories for your platform. Organizations should prioritize updates for systems exposed to untrusted network input, particularly those serving external users or processing unverified content.

Patch guidance

Check vendor advisories from Adobe, Apple, Google, Microsoft, and Linux for patched versions of c2pa and c2pa-web. Apply updates in order of criticality: prioritize internet-facing services and content verification systems first. Test patches in a staging environment before deployment to ensure compatibility with dependent applications. Maintain an inventory of all systems using these libraries to ensure comprehensive coverage.

Detection guidance

Monitor for unexpected application crashes or denial-of-service events in systems using CAI Content Credentials. Look for recurring crashes correlated with processing of external content or input. Network-based detection is difficult without application-specific instrumentation. Enable debug logging in affected applications to capture crash signatures and examine input patterns preceding failures. Establish baseline metrics for application availability to detect anomalies.

Why prioritize this

Although not yet on the CISA Known Exploited Vulnerabilities list, this HIGH-severity, unauthenticated remote denial-of-service vulnerability should be prioritized given its low exploitation barrier and broad platform footprint. Content authentication systems are increasingly critical for media integrity; their availability directly impacts organizational workflows. Organizations heavily reliant on c2pa for content verification should treat this as urgent.

Risk score, explained

The CVSS 7.5 (HIGH) rating reflects the combination of network exploitability, no authentication requirement, and high impact on availability. The absence of confidentiality or integrity impacts prevents a CRITICAL rating, but the ease of triggering denial-of-service without user interaction elevates risk substantially. The broad set of affected platforms amplifies organizational exposure.

Frequently asked questions