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CVE-2026-129356

vllm-project vllm Common Prefix single_type_kv_cache_manager.py race condition

  • Medium 5.0
  • A public exploit reference is listed

Description

A vulnerability was found in vllm-project vllm 0.30.0/0.31.0. This vulnerability affects unknown code of the file single_type_kv_cache_manager.py of the component Common Prefix Handler. The manipulation results in race condition. The attack may be performed from remote. Attacks of this nature are highly complex. It is stated that the exploitability is difficult. The exploit has been made public and could be used. Upgrading to version 0.32.0 is able to resolve this issue. The patch is identified as e687a251bb056fa527846633f7a1b0a6c0f42374. You should upgrade the affected component.

Key facts

Published
15 Nov 2026
Last changed
15 Nov 2026
Assigned by
VulDB
EPSS
0.296% likely to be exploited in the next 30 days, higher than 22.471% of CVEs (scores for 15 Nov 2026)

Severity scores

Each score is shown as its source gave it. They are not averaged or merged.

  • 2.3CVSS 4.0, Lowfrom the CNA (VulDB)CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
  • 5.0CVSS 3.1, Mediumfrom the CNA (VulDB)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
  • 5.0CVSS 3.0, Mediumfrom the CNA (VulDB)CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
  • 4.6CVSS 2.0, Mediumfrom the CNA (VulDB)AV:N/AC:H/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C

Historical context and remediation

This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.

No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.

No explicit remediation statement is available on this page yet. Consult the original record and vendor references before choosing a fix.

Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.

Read the original CVE record.

Affected products

VendorProductVersions
vllm-projectvllm
  • 0.30.0 (affected)
  • 0.31.0 (affected)
  • 0.32.0 (unaffected)

Timeline

  1. 14 Nov 2026 Advisory disclosed
  2. 14 Nov 2026 VulDB entry created
  3. 14 Nov 2026 VulDB entry last update
  4. 15 Nov 2026 Published

Weakness

References