CVE-2026-34711: CAI Content Credentials DOS Vulnerability

CVE-2026-34711 Overview

CVE-2026-34711 is an integer overflow vulnerability [CWE-190] affecting Adobe's Content Authenticity Initiative (CAI) Content Credentials libraries. The flaw impacts c2pa-web@0.7.1, c2pa-v0.80.1, and all earlier versions. An attacker can exploit this issue remotely over the network without authentication or user interaction. Successful exploitation triggers an integer wraparound that crashes the application, producing a denial-of-service condition. The vulnerability affects only availability, with no impact to confidentiality or integrity.

Critical Impact

Remote attackers can crash applications using vulnerable C2PA libraries with no authentication or user interaction required.

Affected Products

• Adobe CAI c2pa-web@0.7.1 and earlier
• Adobe CAI c2pa-v0.80.1 and earlier
• Applications embedding the Content Authenticity SDK

Discovery Timeline

• 2026-06-09 - CVE-2026-34711 published to NVD
• 2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-34711

Vulnerability Analysis

The vulnerability resides in the C2PA (Coalition for Content Provenance and Authenticity) libraries that implement Content Credentials parsing and verification. C2PA libraries process manifests embedded in media files to validate provenance metadata. The flaw is classified as CWE-190 (Integer Overflow or Wraparound).

When the library parses attacker-controlled length or size fields from a malformed C2PA manifest, arithmetic operations on those values wrap around. The wrapped value bypasses bounds checks or produces an invalid allocation size. The resulting state causes the application to terminate abnormally, denying service to downstream content validation workflows.

This class of bug commonly arises in binary parsers that multiply or add untrusted 32-bit or 64-bit integers without saturation checks. The C2PA ecosystem is increasingly embedded into content publishing pipelines, browsers, and editorial tools, which broadens the exposure surface.

Root Cause

The root cause is missing or insufficient validation of integer arithmetic during manifest deserialization. Length, offset, or count fields read from input are used directly in size calculations. When these calculations exceed the representable range of the underlying integer type, the wraparound produces values that violate parser invariants and crash the host process.

Attack Vector

The attack vector is network-based. An attacker delivers a crafted media asset or C2PA manifest to a service or client that uses c2pa-web or c2pa to parse Content Credentials. Parsing the malicious input triggers the overflow and crashes the process. No privileges or user interaction are required.

No verified public exploit code is available. See the Adobe Security Advisory APSB26-61 for vendor-supplied technical details.

Detection Methods for CVE-2026-34711

Indicators of Compromise

• Unexpected process termination or crash logs from services that parse C2PA manifests or Content Credentials.
• Inbound media files containing malformed C2PA manifests with abnormally large length or size fields.
• Repeated request patterns targeting endpoints that ingest images, video, or audio for provenance verification.

Detection Strategies

• Monitor application crash telemetry and core dumps from processes linking c2pa-web or c2pa libraries.
• Inspect C2PA manifests at network ingress for oversized integer fields that exceed expected boundaries.
• Correlate repeated parser failures from the same source IP to identify denial-of-service attempts.

Monitoring Recommendations

• Enable verbose logging on services that perform Content Credentials validation and forward logs to a centralized analytics platform.
• Track process uptime and restart counts for media-processing workers to surface availability degradation.
• Alert on anomalous spikes in media uploads paired with parser exceptions.

How to Mitigate CVE-2026-34711

Immediate Actions Required

• Inventory all applications and services that depend on c2pa-web or the c2pa Rust crate.
• Upgrade to versions newer than c2pa-web@0.7.1 and c2pa-v0.80.1 as published in the Adobe advisory.
• Restrict untrusted media ingestion paths until patched versions are deployed.

Patch Information

Adobe published remediation guidance in Adobe Security Advisory APSB26-61. Update the affected c2pa-web and c2pa library versions to the fixed releases identified in the advisory. Rebuild and redeploy all downstream applications that statically link or bundle these libraries.

Workarounds

• Place C2PA parsing in an isolated, restart-tolerant worker process so crashes do not affect the parent service.
• Apply input size limits at the ingress layer to reject manifests larger than legitimate use cases require.
• Disable Content Credentials validation features in non-essential workflows until patches are applied.

# Verify installed c2pa crate version and upgrade
cargo tree | grep c2pa
cargo update -p c2pa

# For Node.js projects using c2pa-web
npm ls c2pa-web
npm install c2pa-web@latest