CVE-2026-73559— vLLM: Completion prompt lists fan out into unbounded engine requests
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| vllm-project | vllm | >= 0.19.0, < 0.26.0 | affected |
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I. Basic Information for CVE-2026-73559
Vulnerability Information
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Vulnerability Title
vLLM: Completion prompt lists fan out into unbounded engine requests
Source: CVE Program / CVE List V5
Vulnerability Description
vLLM is an inference and serving engine for large language models. From 0.19.0 until 0.26.0, the /v1/completions CompletionRequest.prompt field in vllm/entrypoints/openai/completion/protocol.py accepts an unbounded list[str] or list[list[int]], prompt_to_seq() in vllm/renderers/inputs/preprocess.py and OnlineRenderer.preprocess_completion() in vllm/renderers/online_renderer.py expand every element, and vllm/entrypoints/openai/completion/serving.py creates one engine generator and response slot per prompt, allowing an authenticated API client to exhaust CPU, memory, async scheduling capacity, engine request slots, and response buffering with one request. This issue is fixed in version 0.26.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| vllm-project | vllm | >= 0.19.0, < 0.26.0 | - |
II. Public POCs for CVE-2026-73559
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-73559 (2)
Vendor Advisories for CVE-2026-73559 (1)
Vendor Pages for CVE-2026-73559 (1)
- 🔗 Release v0.26.0 · vllm-project/vllm · GitHubx_refsource_MISC
Same Patch Batch · vllm-project · 2026-08-13 · 5 CVEs total
| CVE-2026-73557 | 6.3 MEDIUM | vLLM: Incomplete CVE-2025-62164 remediation can be bypassed by concurrent prompt parts |
| CVE-2026-73555 | 5.3 MEDIUM | vLLM: Unauthenticated Internal Path and Username Disclosure via Validation Error Messages |
| CVE-2026-73556 | 5.3 MEDIUM | vLLM: ReDoS via structured_outputs.regex in the lm-format-enforcer backend (no compile tim |
| CVE-2026-73558 | 5.3 MEDIUM | vLLM: Cross-User Data Leak Vulnerability |
IV. Related Vulnerabilities
Same product: vllm
- CVE-2026-73558
vLLM: Cross-User Data Leak Vulnerability - CVE-2026-73557
vLLM: Incomplete CVE-2025-62164 remediation can be bypassed - CVE-2026-73556
vLLM: ReDoS via structured_outputs.regex in the lm-format-en - CVE-2026-73555
vLLM: Unauthenticated Internal Path and Username Disclosure - CVE-2026-55514
vLLM denial of service via prompt embeds on M-RoPE models
Same vendor: vllm-project
- CVE-2026-73558
vLLM: Cross-User Data Leak Vulnerability - CVE-2026-73557
vLLM: Incomplete CVE-2025-62164 remediation can be bypassed - CVE-2026-73556
vLLM: ReDoS via structured_outputs.regex in the lm-format-en - CVE-2026-73555
vLLM: Unauthenticated Internal Path and Username Disclosure - CVE-2026-55514
vLLM denial of service via prompt embeds on M-RoPE models
Same weakness: CWE-400
- CVE-2026-73633
Apache Struts: Unbounded read of a JSON request body - CVE-2026-17078
IBM i is Affected By A Denial of Service Vulnerability in DR - CVE-2026-73568
py-libp2p: yamux connection DoS via oversized data frame - CVE-2026-73566
node-tar: Uncontrolled recursion in mapHas/filesFilter allow - CVE-2026-73561
Hub: Unauthenticated WebSocket RPC Waiter Resource Exhaustio
V. Comments for CVE-2026-73559
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