CVE-2025-48956: vllm API endpoints vulnerable to Denial of Service Attacks

August 21, 2025

A Denial of Service (DoS) vulnerability can be triggered by sending a single HTTP GET request with an extremely large header to an HTTP endpoint. This results in server memory exhaustion, potentially leading to a crash or unresponsiveness. The attack does not require authentication, making it exploitable by any remote user.

References

github.com/advisories/GHSA-rxc4-3w6r-4v47
github.com/vllm-project/vllm
github.com/vllm-project/vllm/commit/d8b736f913a59117803d6701521d2e4861701944
github.com/vllm-project/vllm/pull/23267
github.com/vllm-project/vllm/security/advisories/GHSA-rxc4-3w6r-4v47
nvd.nist.gov/vuln/detail/CVE-2025-48956

Code Behaviors & Features

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