CVE-2025-48956

vLLM API endpoints vulnerable to Denial of Service Attacks

Description

vLLM is an inference and serving engine for large language models (LLMs). From 0.1.0 to before 0.10.1.1, 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. This vulnerability is fixed in 0.10.1.1.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.25%
Affected: vllm-project vllm
Published at:
Updated at:

References

Link Tags
https://github.com/vllm-project/vllm/security/advisories/GHSA-rxc4-3w6r-4v47
https://github.com/vllm-project/vllm/pull/23267
https://github.com/vllm-project/vllm/commit/d8b736f913a59117803d6701521d2e4861701944

Frequently Asked Questions

What is the severity of CVE-2025-48956?
CVE-2025-48956 has been scored as a high severity vulnerability.
How to fix CVE-2025-48956?
To fix CVE-2025-48956, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-48956 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-48956 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-48956?
CVE-2025-48956 affects vllm-project vllm.
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