CVE-2026-54234

vLLM is a high-throughput and memory-efficient inference and serving engine for LLMs. Prior to 0.24.0, a frontend-legal multi-request speculative decoding workload can cause the rejection sampler to produce a recovered token equal to the model vocabulary size boundary value, which is then converted to negative one when the engine selects the next live token for a request and is written back into the drafter's input ids; that out-of-vocabulary value is later consumed by the model's embedding and attention path and crashes the engine worker with a GPU device-side assertion. The same triggering request sequence is reachable through the public gRPC Generate and Abort endpoints, so a remote client that can send generation requests can crash the shared engine worker, aborting concurrent requests and causing a service-wide denial of service for other clients of the deployment until the worker is restarted. This issue is fixed in version 0.24.0.

• CWE-20
• CWE-1284

• https://github.com/vllm-project/vllm/commit/8a5cf1ccd65e8ac7635c402c1ec0b08988bc26caPatch
• https://github.com/vllm-project/vllm/pull/44744Issue Tracking, Patch
• https://github.com/vllm-project/vllm/security/advisories/GHSA-8wr5-jm2h-8r4fVendor Advisory, Exploit
• https://github.com/vllm-project/vllm/security/advisories/GHSA-8wr5-jm2h-8r4fVendor Advisory, Exploit

Published

Jul 6, 2026

Last Modified

Jul 7, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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