CVE-2026-90878

vllm-project vLLM Jinja Template Rendering completions resource consumption

MEDIUM
4.3
CVSS Score
Published: September 15, 2026 at 04:15 AM UTC
Updated: September 15, 2026 at 02:51 PM UTC
1 product affected across 1 vendorvLLM

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (7)

VDB EntryTechnical Description
Source: cverecord
https://vuldb.com/vuln/403472
SignaturePermissions Required
Source: cverecord
https://vuldb.com/vuln/403472/cti
Third Party Advisory
Source: cverecord
https://vuldb.com/cve/CVE-2026-90878
Third Party Advisory
Source: cverecord
https://vuldb.com/submit/927901
ExploitIssue Tracking
Source: cverecord
https://github.com/vllm-project/vllm/issues/52025
Issue TrackingPatch
Source: cverecord
https://github.com/vllm-project/vllm/pull/52163

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-400CWE-404

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