How severe is CVE-2025-62426?

CVE-2025-62426 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-2025-62426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-62426?

CVE-2025-62426 primarily affects Vllm. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-62426?

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

Does CVE-2025-62426 have an EU (EUVD) identifier?

Yes. CVE-2025-62426 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198356.

When was CVE-2025-62426 published?

CVE-2025-62426 was published on 2025-11-21 and last updated on 2026-06-17.

CVE-2025-62426

CVE-2025-62426 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-770.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-198356
Weakness: CWE-770
Affected product: Vllm
Published: 2025-11-21
Last modified: 2026-06-17

Description

vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before 0.11.1, the /v1/chat/completions and /tokenize endpoints allow a chat_template_kwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chat_template_kwargs parameters, it is possible to block processing of the API server for long periods of time, delaying all other requests. This issue has been patched in version 0.11.1.

Frequently asked questions

What is CVE-2025-62426?: vLLM is an inference and serving engine for large language models (LLMs). From version 0.5.5 to before 0.11.1, the /v1/chat/completions and /tokenize endpoints allow a chat_template_kwargs request parameter that is used in the code before it is properly validated against the chat template. With the right chat_template_kwargs parameters, it is possible to block processing of the API server for long periods of time, delaying all other requests. This issue has been patched in version 0.11.1.
How severe is CVE-2025-62426?: CVE-2025-62426 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-2025-62426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-62426?: CVE-2025-62426 primarily affects Vllm. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-62426?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-62426 have an EU (EUVD) identifier?: Yes. CVE-2025-62426 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-198356.
When was CVE-2025-62426 published?: CVE-2025-62426 was published on 2025-11-21 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*
cpe:2.3:a:vllm:vllm:0.11.1:rc0:*:*:*:*:*:*
cpe:2.3:a:vllm:vllm:0.11.1:rc1:*:*:*:*:*:*

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