How severe is CVE-2025-48943?

CVE-2025-48943 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-48943 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-48943?

CVE-2025-48943 affects Vllm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-48943?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-48943 have an EU (EUVD) identifier?

Yes. CVE-2025-48943 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16515.

When was CVE-2025-48943 published?

CVE-2025-48943 was published on 2025-05-30 and last updated on 2026-06-17.

CVE-2025-48943

CVE-2025-48943 is a medium-severity vulnerability in Vllm with a CVSS 3.x base score of 6.5. 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-248.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16515
Weakness: CWE-248
Affected product: Vllm
Published: 2025-05-30
Last modified: 2026-06-17

Description

vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.

Frequently asked questions

What is CVE-2025-48943?: vLLM is an inference and serving engine for large language models (LLMs). Version 0.8.0 up to but excluding 0.9.0 have a Denial of Service (ReDoS) that causes the vLLM server to crash if an invalid regex was provided while using structured output. This vulnerability is similar to GHSA-6qc9-v4r8-22xg/CVE-2025-48942, but for regex instead of a JSON schema. Version 0.9.0 fixes the issue.
How severe is CVE-2025-48943?: CVE-2025-48943 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-48943 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-48943?: CVE-2025-48943 affects Vllm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-48943?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-48943 have an EU (EUVD) identifier?: Yes. CVE-2025-48943 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16515.
When was CVE-2025-48943 published?: CVE-2025-48943 was published on 2025-05-30 and last updated on 2026-06-17.

References

Affected products (1)

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

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