Advisory details:
pypa / vllm/PYSEC-2026-250
| Advisory ID | pypa/vllm/PYSEC-2026-250 |
| Aliases |
CVE-2026-56340
GHSA-mcmc-2m55-j8jj PYSEC-2026-250 |
| Summary | vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing. Because PyTorch disables sparse tensor invariant checks by default, an attacker can submit crafted embedding requests with malformed (negative or out-of-bounds) tensor indices, when the prompt-embeds feature is enabled, to trigger crashes or resource exhaustion (denial of service), with potential for out-of-bounds/write-what-where memory corruption. This continues CVE-2025-62164, whose prior fix only disabled the feature by default rather than addressing the root cause. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 6.8 |
| Risk | 3.4 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| There are no known CWE. |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 7.5 | https://github.com/pypa/advisory-database/blob/main/vulns/vllm/PYSEC-2026-250.yaml |
| Reference id | Reference type | URL |
|---|---|---|
| https://www.vulncheck.com/advisories/vllm-denial-of-service-via-unvalidated-multimodal-embeddings | ||
| GHSA-mcmc-2m55-j8jj | https://github.com/vllm-project/vllm/security/advisories/GHSA-mcmc-2m55-j8jj |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-06-24T15:54:59Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/56xxx/CVE-2026-56340.json
Source Advisory: vulnrichment/CVE-2026-56340
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-06-24T15:54:59Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/56xxx/CVE-2026-56340.json
Source Advisory: vulnrichment/CVE-2026-56340
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]