CVE-2026-103241: vllm — Fix

Description

A flaw has been found in vllm-project vLLM up to 0.26.0. This vulnerability affects unknown code of the file rust/src/parser/src/unified/gemma4.rs of the component Gemma4UnifiedParser. Executing a manipulation can lead to denial of service. The attack may be launched remotely. The exploit has been published and may be used. Upgrading to version 0.29.1rc0 is able to resolve this issue. This patch is called 3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9. Upgrading the affected component is advised.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS — Exploit Prediction

0.0071

Probability of exploitation

0.52%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-404 CWE-404

Affected Products

Vendor	Product	Versions
vllm	vllm	< 0.26.0

References

Advisories & Patches

https://github.com/vllm-project/vllm/commit/3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9 https://github.com/vllm-project/vllm/issues/50927 https://github.com/vllm-project/vllm/pull/54303

Other References

https://gist.github.com/Yunzez/8e98d656aa667095b513161eb056d28e https://github.com/vllm-project/vllm/ https://github.com/vllm-project/vllm/releases/tag/v0.29.1rc0 https://vuldb.com/cve/CVE-2026-103241 https://vuldb.com/submit/956250 https://vuldb.com/vuln/411965 https://vuldb.com/vuln/411965/cti

Frequently Asked Questions

What is CVE-2026-103241? +

A flaw has been found in vllm-project vLLM up to 0.26.0. This vulnerability affects unknown code of the file rust/src/parser/src/unified/gemma4.rs of the component Gemma4UnifiedParser. Executing a manipulation can lead to denial of service. The attack may be launched remotely. The exploit has been published and may be used. Upgrading to version 0.29.1rc0 is able to resolve this issue. This patch is called 3439bad37e68ba9755a46f4f6b44a4aeaf1f60a9. Upgrading the affected component is advised. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-103241? +

CVE-2026-103241 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0071, placing it in the 1th percentile for exploitation probability.

What products are affected by CVE-2026-103241? +

CVE-2026-103241 affects products from vllm, specifically: vllm. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-103241? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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