Denial of Service Vulnerability in vLLM by vllm-project
CVE-2026-103241

6.9MEDIUM

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
30 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-103241?

A flaw has been identified in the vLLM software by vllm-project, specifically within the Gemma4UnifiedParser component. This vulnerability allows for a denial of service, which can be exploited remotely through manipulation of certain code segments within the parser. The vulnerable versions of vLLM are up to 0.26.0. To mitigate this issue, it is recommended to upgrade to version 0.29.1rc0, which includes a fix. For detailed mitigation, refer to the patch and upgrade instructions provided in the official documentation.

Affected Version(s)

vLLM 0.1

vLLM 0.2

vLLM 0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-103241 - Proof of Concept

References

https://vuldb.com/vuln/411965
vdb-entry
https://vuldb.com/vuln/411965/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-103241
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Zyz3366 (VulDB User)
.