Resource exhaustion in Vllm-Project Vllm
CVE-2026-90878
A vulnerability was determined in vllm-project vLLM up to 0.27.1. This affects an unknown part of the file /v1/chat/completions of the component Jinja Template Rendering. This manipulation of the argument chat_template causes resource consumption. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The pull request to fix this issue awaits acceptance.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (44.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Vllm-Project Vllm — versions 0.27.0, 0.27.1
Weakness classification (CWE)
References
- vuldb.com/vuln/403472 (technical-description, vdb-entry)
- vuldb.com/vuln/403472/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90878 (third-party-advisory)
- vuldb.com/submit/927901 (third-party-advisory)
- github.com/vllm-project/vllm/issues/52025 (issue-tracking, exploit)
- github.com/vllm-project/vllm/pull/52163 (issue-tracking, patch)
- github.com/vllm-project/vllm/ (product)
Frequently asked questions
- What is CVE-2026-90878?
- CVE-2026-90878 is a medium-severity vulnerability in Vllm-Project Vllm, classified under Uncontrolled Resource Consumption. CVSS score: 4.3/10. Published 2026-09-15.
- How severe is CVE-2026-90878?
- Medium severity. CVSS v3 base score is 4.3 out of 10.