Is CVE-2026-34753 actively exploited?

No active exploitation of CVE-2026-34753 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34753 be exploited remotely?

Yes. CVE-2026-34753 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34753?

CVE-2026-34753 has a CVSS score of 5.4 (MEDIUM).

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MEDIUM

CVE-2026-34753

CWE-918Published: April 6, 2026· Updated: Apr 7, 2026

5.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.8th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34753 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.