Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-71486

CVE-2026-71486MEDIUM

vllm-project vllm — vLLM: Derender endpoints decode caller-supplied GenerateResponse token IDs without output bounds

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  L    4.3   .0047   38.1     —

AFFECTED
  Product  Versions    Fixed
  vllm     < 0.26.0 –  —

TIMELINE
  Aug 6   Reserved by GitHub_M
  Aug 17  Published (CNA: GitHub_M)
  Oct 2   EXPLOIT PUBLISHED — CVE-2026-71486 (vllm-project vllm). Public exploit reference added.

CWE-400, CWE-770 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

Description

vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the /v1/completions/derender and /v1/chat/completions/derender endpoints accept caller-supplied GenerateResponse objects whose generate_responses, choices, token_ids, prompt_logprobs, logprobs.content, top_logprobs, and routed_experts structures are processed by OnlineDerenderer and tokenizer.decode before max_model_len, max_tokens, max_num_seqs, or response-size limits are enforced, allowing an authenticated API client to consume excessive CPU and memory and produce oversized responses. This issue is fixed in version 0.26.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 6, 2026	Reserved	Reserved by GitHub_M
August 17, 2026	Published	Published (CNA: GitHub_M)
October 2, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-71486 (vllm-project vllm). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
vllm-project	vllm	—	< 0.26.0	—

Weaknesses

CWE-400 · CWE-770

References (4)

https://github.com/vllm-project/vllm/commit/8e61b646e2d157f9b93451fa048f9c8530c8a67b [Patch]
https://github.com/vllm-project/vllm/pull/47260 [Issue Tracking, Patch]
https://github.com/vllm-project/vllm/releases/tag/v0.26.0 [Release Notes]
https://github.com/vllm-project/vllm/security/advisories/GHSA-8737-qx52-hjff [Exploit, Vendor Advisory, Mitigation]

Authoritative record: CVE-2026-71486 at cve.org

Vendors: vllm-project

Weaknesses: CWE-400 · CWE-770

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-71486 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.