CVE-2026-129356
vllm-project vllm Common Prefix single_type_kv_cache_manager.py race condition
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulDBFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulDBFix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulDBAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| vllm vllm-project |
0.30.0 (affected) 0.31.0 (affected) 0.32.0 (unaffected) |
CNA: VulDB |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
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 | CNA: VulDB |
| 3.1 / 5.0 medium |
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 | CNA: VulDB |
| 3.0 / 5.0 medium |
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 | CNA: VulDB |
| 2.0 / 4.6 medium |
AV:N/AC:H/Au:S/C:P/I:P/A:P/E:POC/RL:OF/RC:C | CNA: VulDB |
Exploit evidence
- https://github.com/vllm-project/vllm/issues/61673
exploit · CNA: VulDB
References
- https://vuldb.com/vuln/437419CNA: VulDB · vdb-entry
- https://vuldb.com/vuln/437419/ctiCNA: VulDB · signature, permissions-required
- https://vuldb.com/cve/CVE-2026-129356CNA: VulDB · third-party-advisory
- https://vuldb.com/submit/1043823CNA: VulDB · third-party-advisory
- https://github.com/vllm-project/vllm/issues/61673CNA: VulDB · exploit, issue-tracking
- https://github.com/vllm-project/vllm/pull/61126CNA: VulDB · issue-tracking, patch
- https://github.com/vllm-project/vllm/commit/e687a251bb056fa527846633f7a1b0a6c0f42374CNA: VulDB · patch
- https://github.com/vllm-project/vllm/releases/tag/v0.32.0CNA: VulDB · patch
- https://github.com/vllm-project/vllm/CNA: VulDB · product
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