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CVE-2026-34755

vLLM: Denial of Service via Unbounded Frame Count in video/jpeg Base64 Processing

Impact

vLLM is an inference and serving engine for large language models (LLMs). From 0.7.0 to before 0.19.0, the VideoMediaIO.load_base64() method at vllm/multimodal/media/video.py splits video/jpeg data URLs by comma to extract individual JPEG frames, but does not enforce a frame count limit. The num_frames parameter (default: 32), which is enforced by the load_bytes() code path, is completely bypassed in the video/jpeg base64 path. An attacker can send a single API request containing thousands of comma-separated base64-encoded JPEG frames, causing the server to decode all frames into memory and crash with OOM. This vulnerability is fixed in 0.19.0.

Affected packages

EcosystemPackageAffectedFixed in
pipvllm>= 0.7.0, < 0.19.00.19.0

Affected products

VendorProductAffected versions
VllmVllm
from 0.7.0 before 0.19.0

Weakness classification

CWE-770

References