{"id":"CVE-2026-71486","title":"vLLM is an inference and serving engine for large language models","summary":"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, choice…","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-400","CWE-770"],"vendor":"vllm","product":"vllm","affected":["vllm < 0.26.0"],"patched":["vllm 0.26.0"],"published":"2026-08-17","updated":"2026-10-02","sourceUpdated":"2026-10-02T19:30:34.767","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71486","references":[{"url":"https://github.com/vllm-project/vllm/commit/8e61b646e2d157f9b93451fa048f9c8530c8a67b","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/pull/47260","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/releases/tag/v0.26.0","label":"security-advisories@github.com"},{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-8737-qx52-hjff","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-71486"},{"url":"https://github.com/advisories/GHSA-8737-qx52-hjff"},{"url":"https://github.com/vllm-project/vllm"},{"url":"https://pypi.org/project/vllm"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71486.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-71486"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2517595"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71486"},{"url":"https://access.redhat.com/errata/RHSA-2026:82415"},{"url":"https://access.redhat.com/errata/RHSA-2026:82368"},{"url":"https://access.redhat.com/errata/RHSA-2026:82061"},{"url":"https://access.redhat.com/errata/RHSA-2026:82059"},{"url":"https://access.redhat.com/errata/RHSA-2026:82371"}],"tags":["nvd","ghsa","pip","osv","exploit-available","csaf","vex","red-hat"],"epss":0.00374,"epssPercentile":0.31147,"aliases":["GHSA-8737-qx52-hjff","PYSEC-2026-3936"],"ecosystem":"pip","ingestedAt":"2026-09-04T22:28:54.993Z","exploitAvailable":true,"slug":"CVE-2026-71486","body":"## Overview\n\nvLLM 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.\n\n## Affected\n\n- `vllm < 0.26.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `vllm 0.26.0`\n\n## Package advisory (CVE-2026-71486)\n\nAffected packages:\n\n- `vllm < 0.26.0`\n\nPatched in:\n\n- `vllm 0.26.0`\n\nSource: https://github.com/advisories/GHSA-8737-qx52-hjff\n\n## Vendor advisories\n\n- **RHSA-2026:82415** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82415)\n- **RHSA-2026:82368** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82368)\n- **RHSA-2026:82061** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82061)\n- **RHSA-2026:82059** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82059)\n- **RHSA-2026:82371** · Red Hat · fixed in: Red Hat AI Inference Server 3.5 · released 2026-10-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:82371)\n- **Red Hat VEX** · Moderate · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · updated 2026-10-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-71486.json)","depth":"twilight","depthScore":36,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":216151,"id":"CVE-2026-71486","ts":1791259811022,"field":"exploit_available","old":"false","new":"true"}]}