vllm-project vLLM up to 0.27.1 Jinja Template Rendering /v1/chat/completions chat_template resource consumption

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.9$0-$5k2.01-

Summaryinfo

A vulnerability was found in vllm-project vLLM up to 0.27.1. It has been declared as problematic. This vulnerability affects unknown code of the file /v1/chat/completions of the component Jinja Template Rendering. Such manipulation of the argument chat_template leads to resource consumption. This vulnerability is uniquely identified as CVE-2026-90878. The attack can be launched remotely. Moreover, an exploit is present. The pull request to fix this issue awaits acceptance.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in vllm-project vLLM up to 0.27.1. Affected by this issue is some unknown processing of the file /v1/chat/completions of the component Jinja Template Rendering. The manipulation of the argument chat_template with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-90878. The exploitation is known to be easy. The attack may be launched remotely. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1499.

The exploit is available at github.com. It is declared as proof-of-concept. The pull request to fix this issue awaits acceptance.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 3.9

VulDB Base Score: 4.3
VulDB Temp Score: 3.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Resource consumption
CWE: CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

09/14/2026 Advisory disclosed
09/14/2026 +0 days VulDB entry created
09/14/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 52025
Status: Not defined
Confirmation: 🔒

CVE: CVE-2026-90878 (🔒)
GCVE (CVE): GCVE-0-2026-90878
GCVE (VulDB): GCVE-100-403472
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 09/14/2026 09:21
Changes: 09/14/2026 09:21 (60)
Complete: 🔍
Submitter: Zyz3366
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #927901: vLLM Project vLLM 0.27.1 Asymmetric Resource Consumption (by Zyz3366)

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