How severe is CVE-2025-48956?

CVE-2025-48956 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-48956 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-48956?

CVE-2025-48956 affects Vllm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-48956?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-48956 have an EU (EUVD) identifier?

Yes. CVE-2025-48956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25446.

When was CVE-2025-48956 published?

CVE-2025-48956 was published on 2025-08-21 and last updated on 2026-06-17.

CVE-2025-48956

CVE-2025-48956 is a high-severity vulnerability in Vllm with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-25446
Weakness: CWE-400
Affected product: Vllm
Published: 2025-08-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2025-48956?: CVE-2025-48956 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-48956 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-48956?: CVE-2025-48956 affects Vllm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-48956?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-48956 have an EU (EUVD) identifier?: Yes. CVE-2025-48956 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-25446.
When was CVE-2025-48956 published?: CVE-2025-48956 was published on 2025-08-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

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