CVE-2026-7141vLLM KV Block kv_cache_interface.py has_mamba_layers uninitialized resource
- 6.3MediumCVSS base score
- 0.29%Exploitation in 30 daysEPSS · top 78% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- YesPublic exploitsa reference or SSVC says so
Description
A vulnerability was found in vLLM up to 0.19.0. The affected element is the function has_mamba_layers of the file vllm/v1/kv_cache_interface.py of the component KV Block Handler. Performing a manipulation results in uninitialized resource. It is possible to initiate the attack remotely. The attack is considered to have high complexity. The exploitability is described as difficult. The exploit has been made public and could be used. The existence of this vulnerability is still disputed at present. The proposed patch did not fix the issue. A 3rd party explains: "The divergence could be explained by a benign and expected vLLM behavior where vLLM server could group concurrent requests together resulting in different input shapes based on varying request arrival time. The differences in grouped input shapes could call different kernels with could produce difference results due to rounding and differences in order of operations. There is an environment variable VLLM_BATCH_INVARIANT=1 for users that desire to have deterministic output with temperature 0.0."
Public exploit
An exploit or proof of concept is public: anyone can try it against an unpatched system. A reference of the record is tagged as an exploit. CISA's SSVC rates its exploitation: a proof of concept is public.
Show the exploits1
References tagged exploit1 reference
Timeline
ID reserved
By VulDB
- 1 day later
· 1 day later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| VulDBCNA (assigner) | 4.0 | Medium6.3 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P |
| VulDBCNA (assigner) | 3.1 | Medium5.6 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:R |
| VulDBCNA (assigner) | 3.0 | Medium5.6 | CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:U/RC:R |
| VulDBCNA (assigner) | 2.0 | Medium5.1 | AV:N/AC:H/Au:N/C:P/I:P/A:P/E:POC/RL:U/RC:UR |
| NVDNVD · Modified | 4.0 | Low2.9 | CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.29% · top 78% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: poc · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Affected products
vLLM
- affected 0.1
- affected 0.2
- affected 0.3
- affected 0.4
- affected 0.5
- affected 0.6
- affected 0.7
- affected 0.8
- affected 0.9
- affected 0.10
- affected 0.11
- affected 0.12
- affected 0.13
- affected 0.14
- affected 0.15
- affected 0.16
- affected 0.17
- affected 0.18
- affected 0.19.0
Affected packages
From reviewed advisories of the GitHub Advisory Database.
References
References6
- VDB-359740 | vLLM KV Block kv_cache_interface.py has_mamba_layers uninitialized resource (opens in a new tab)vdb-entrytechnical-description
- VDB-359740 | CTI Indicators (IOB, IOC, IOA) (opens in a new tab)signaturepermissions-required
- CVE-2026-7141 | CVE Analysis and Report (opens in a new tab)third-party-advisory
- Submit #801297 | vllm-project vLLM 0.19.0 Use of Uninitialized Resource (opens in a new tab)third-party-advisory
- https://github.com/vllm-project/vllm/issues/39146 (opens in a new tab)issue-tracking
- https://github.com/vllm-project/vllm/issues/39146#issue-4215090365 (opens in a new tab)exploitissue-tracking
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-25892 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-x368-4g9h-fvv4 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-7141)Record last updated .