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

Source: https://junglewise.ai/threats/cve-2026-34667-adobe-cai-content-credentials-integer-underflow-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-12. Updated: 2026-06-09  
License: CC BY 4.0 with a link back

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](https://junglewise.ai/threats/technologies/c2pa), [Adobe C2pa-Rust](https://junglewise.ai/threats/technologies/c2pa-rust), [Adobe C2pa-Web](https://junglewise.ai/threats/technologies/c2pa-web). Vendors: [Adobe](https://junglewise.ai/threats/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

- [https://helpx.adobe.com/security/products/content-authenticity-sdk/apsb26-53.html](https://helpx.adobe.com/security/products/content-authenticity-sdk/apsb26-53.html)

## Related threats

- [Adobe Content Credentials SDK server-side request forgery](https://junglewise.ai/threats/cve-2026-95634-cai-content-credentials-is-affected-by-a-server-side-request)
- [Adobe Content Credentials Rust SDK improper cryptographic signature verification](https://junglewise.ai/threats/cve-2026-95633-cai-content-credentials-is-affected-by-an-improper-verification)
- [Adobe Content Credentials improper cryptographic signature verification](https://junglewise.ai/threats/cve-2026-95632-cai-content-credentials-is-affected-by-an-improper-verification)
- [Adobe Content Credentials SDK multiple security feature bypasses](https://junglewise.ai/threats/cve-2026-48378-cai-content-credentials-is-affected-by-an-improper-input)
- [Adobe Content Credentials SDK improper input validation and certificate bypass](https://junglewise.ai/threats/cve-2026-48377-cai-content-credentials-is-affected-by-an-improper-input)