What’s Vulnerable › Vulnerabilities

CVE-2026-90878: vllm-project vLLM Jinja Template Rendering completions resource consumption

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-15
• Weakness: CWE-400

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 products

• vllm-project vllm: 0.27.0, 0.27.1

References

• https://github.com/vllm-project/vllm/
• https://github.com/vllm-project/vllm/issues/52025
• https://github.com/vllm-project/vllm/pull/52163
• https://vuldb.com/cve/CVE-2026-90878
• https://vuldb.com/submit/927901
• https://vuldb.com/vuln/403472
• https://vuldb.com/vuln/403472/cti

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