Internal service access via unrestricted batch URL fetch
Published Apr 6, 2026 · Updated Apr 6, 2026
SSRF in vLLM 0.16.0 through 0.18.x allows attackers to access internal HTTP services through crafted batch input JSON. In vllm/entrypoints/openai/run_batch.py, download_bytes_from_url passes transcription or translation file_url values directly to aiohttp.ClientSession.get without validating the host, address, port, or redirect target. Control over batch input JSON is required; resulting requests can reach internal APIs or cloud metadata services and expose data or interrupt batch processing.
Summary
What happened
SSRF in vLLM 0.16.0 through 0.18.x allows attackers to access internal HTTP services through crafted batch input JSON. In vllm/entrypoints/openai/run_batch.py, download_bytes_from_url passes transcription or translation file_url values directly to aiohttp.ClientSession.get without validating the host, address, port, or redirect target. Control over batch input JSON is required; resulting requests can reach internal APIs or cloud metadata services and expose data or interrupt batch processing.
The record
- CVE
- CVE-2026-34753
- Published
- Apr 6, 2026
- Updated
- Apr 6, 2026
- Vendor
- vLLM Project
- Product
- vLLM
- Classifications
- CWE-918
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 6, 2026CVE publishedPublication date reported by the CVE source.
- Apr 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 0.16.0, < 0.19.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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