CVE-2026-90878 Details
Description
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.
A denial-of-service vulnerability has been identified in vLLM versions through 0.27.1. The issue arises in the Jinja template rendering component, specifically within the file '/v1/chat/completions'. The vulnerability allows for unbounded evaluation of caller-supplied chat templates, leading to excessive resource consumption. This can be exploited remotely, with the potential to cause significant delays in request processing. The vulnerability has been publicly disclosed and a pull request to address the issue is pending acceptance.
The pull request to fix this vulnerability is available on the vLLM GitHub repository, but it awaits acceptance.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 15, 2026CISA-ADP
Assessed Sep 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/vllm-project/vllm/ | [email protected] | Vendor |
| https://github.com/vllm-project/vllm/issues/52025 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/vllm-project/vllm/pull/52163 | [email protected] | Issue TrackingVendor |
| https://vuldb.com/cve/CVE-2026-90878 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/927901 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/403472 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/vuln/403472/cti | [email protected] | AdvisoryPermission Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-404 | Improper Resource Shutdown or Release | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vllm-project vLLM | <= 0.27.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 15, 2026 | CVE Modified | CISA-ADP |
| Sep 15, 2026 | New CVE Received | [email protected] |