CVE-2026-34667: Adobe CAI Content Credentials integer underflow denial of service

CVE-2026-34667 · Severity: medium · CVSS 6.2 · Published 2026-05-12

Adobe CAI Content Credentials, a toolset used to verify the authenticity and origin of digital content, is affected by a software flaw. An attacker could exploit this vulnerability to cause applications using these tools to crash unexpectedly. This results in a denial-of-service, preventing users from verifying content credentials or using related features until the application is restarted.

Technologies: Adobe C2pa, Adobe C2pa-Rust, Adobe C2pa-Web. Vendors: Adobe.

Quick answers

Is CVE-2026-34667 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-34667 being exploited in the wild.
How severe is CVE-2026-34667?
Medium severity, with a CVSS score of 6.2, published 12 May 2026.
Which products and versions are affected?
Adobe C2pa-Rust <= 0.78.2; Adobe C2pa-Web <= 0.7.0; Adobe Content Credentials (C2PA) SDK 0.78.2, 0.7.0 and earlier.
Is there a fix for CVE-2026-34667?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-34667 attacked?
It is attacked with local access, in a software library.
Am I affected by CVE-2026-34667?
Check whether you run Adobe C2pa, Adobe C2pa-Rust, Adobe C2pa-Web or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer underflow (CWE-191) exists in the Adobe Content Authenticity Initiative (CAI) SDK, specifically affecting the c2pa-web (Node.js) and c2pa (Rust) implementations. The vulnerability is triggered during the processing of content credentials, where a wrap-around error leads to an application crash. The attack vector is classified as local, meaning an attacker must be able to provide a malicious payload to the affected application. Exploitation does not require administrative privileges or user interaction. Successful exploitation results in a denial-of-service (DoS) condition. Patches are available in c2pa-web version 0.7.1 and c2pa version 0.80.1.

Affected products

  • Adobe c2pa-web <= 0.7.0
  • Adobe c2pa-rust (c2pa) <= 0.78.2

Timeline

  • 2026-05-12: disclosed
  • 2026-05-12: advisory

References

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