CVE-2025-48956 — Uncontrolled Resource Consumption

Vendor	Product	Version range	Fixed in
vllm-project	vllm	—	—
vllm	vllm	>= 0.1.0 < 0.10.1.1	0.10.1.1
vllm	vllm	>= 0.1.0 < 0.10.1.1	0.10.1.1

OSV

vllm API endpoints vulnerable to Denial of Service Attacks

osv·2025-08-21

CVE-2025-48956 [HIGH] vllm API endpoints vulnerable to Denial of Service Attacks vllm API endpoints vulnerable to Denial of Service Attacks ### Summary 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. ### Details The vulnerability leverages the abuse of HTTP headers. By setting a header such as `X-Forwarded-For` to a very large value like `("A" * 5_800_000_000)`, the server's HTTP parser or application logic may attempt to load the entire request into memory, overwhelming system resources. ### Impact _What kind of vulnerability is it? Who is impacted?_ Type of vulnerability: Denial of Service (

GHSA

vllm API endpoints vulnerable to Denial of Service Attacks

ghsa·2025-08-21

CVE-2025-48956 [HIGH] CWE-400 vllm API endpoints vulnerable to Denial of Service Attacks vllm API endpoints vulnerable to Denial of Service Attacks ### Summary 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. ### Details The vulnerability leverages the abuse of HTTP headers. By setting a header such as `X-Forwarded-For` to a very large value like `("A" * 5_800_000_000)`, the server's HTTP parser or application logic may attempt to load the entire request into memory, overwhelming system resources. ### Impact _What kind of vulnerability is it? Who is impacted?_ Type of vulnerability: Denial of Service (

Red Hat

vllm: HTTP header size limit not enforced allows Denial of Service from Unauthenticated requests

vendor_redhat·2025-08-26·CVSS 7.5

CVE-2025-48956 [HIGH] CWE-130 vllm: HTTP header size limit not enforced allows Denial of Service from Unauthenticated requests vllm: HTTP header size limit not enforced allows Denial of Service from Unauthenticated requests 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. A flaw was found in vLLM. A denial of service (DoS) vulnerability can be triggered by sending a single HTTP GET request with an extremely large X-Forwarded-For header to an HTTP endpoint. This results in server memory exhaustion,

CVE-2025-48956: 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…

Affected

CVSS provenance