How severe is CVE-2026-34753?

CVE-2026-34753 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2026-34753 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34753?

CVE-2026-34753 affects Vllm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34753?

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

Does CVE-2026-34753 have an EU (EUVD) identifier?

Yes. CVE-2026-34753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19349.

When was CVE-2026-34753 published?

CVE-2026-34753 was published on 2026-04-06 and last updated on 2026-06-17.

CVE-2026-34753

CVE-2026-34753 is a medium-severity vulnerability in Vllm with a CVSS 3.x base score of 5.4. 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-918.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (16th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19349
Weakness: CWE-918
Affected product: Vllm
Published: 2026-04-06
Last modified: 2026-06-17

Description

vLLM is an inference and serving engine for large language models (LLMs). From 0.16.0 to before 0.19.0, a server-side request forgery (SSRF) vulnerability in download_bytes_from_url allows any actor who can control batch input JSON to make the vLLM batch runner issue arbitrary HTTP/HTTPS requests from the server, without any URL validation or domain restrictions. This can be used to target internal services (e.g. cloud metadata endpoints or internal HTTP APIs) reachable from the vLLM host. This vulnerability is fixed in 0.19.0.

Frequently asked questions

What is CVE-2026-34753?: vLLM is an inference and serving engine for large language models (LLMs). From 0.16.0 to before 0.19.0, a server-side request forgery (SSRF) vulnerability in download_bytes_from_url allows any actor who can control batch input JSON to make the vLLM batch runner issue arbitrary HTTP/HTTPS requests from the server, without any URL validation or domain restrictions. This can be used to target internal services (e.g. cloud metadata endpoints or internal HTTP APIs) reachable from the vLLM host. This vulnerability is fixed in 0.19.0.
How severe is CVE-2026-34753?: CVE-2026-34753 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2026-34753 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (16th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34753?: CVE-2026-34753 affects Vllm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34753?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-34753 have an EU (EUVD) identifier?: Yes. CVE-2026-34753 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19349.
When was CVE-2026-34753 published?: CVE-2026-34753 was published on 2026-04-06 and last updated on 2026-06-17.

References

https://github.com/vllm-project/vllm/security/advisories/GHSA-pf3h-qjgv-vcpr

Affected products (1)

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

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