PYSEC-2026-4319: vllm (CVE-2026-105922)

A security flaw has been discovered in vllm-project vLLM up to 0.31.0. This impacts the function get_token_bin_counts_and_mask of the file vllm/model_executor/layers/utils.py of the component Penal...

CVSS 5.3 MediumEPSS 0.0031 · 24th percentile

Published by OSV at 6 Oct 2026, 15:17 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
vllm	PyPI	<0.32.0	0.32.0

Identifiers

PYSEC-2026-4319 · CVE-2026-105922

Weakness (CWE)

CWE-404

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

vLLM versions up to 0.31.0 (fixed in 0.32.0) contain a flaw in the penalty handling code, specifically the get_token_bin_counts_and_mask function. A remote attacker can manipulate input to cause a denial of service, and a public exploit exists. The source gives few details on the exact trigger. Upgrade vllm to version 0.32.0 or later.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.3	Medium	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	CNA (VulDB)

CISA KEV Not listed.
EPSS 0.0031, the 24th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:08 UTC First seen by agentprime
31 Oct 2026, 14:08 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.