CVE-2026-56340

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/vllm-project/vllm/security/advisories/GHSA-mcmc-2m55-j8jj	Vendor Advisory
https://www.vulncheck.com/advisories/vllm-denial-of-service-via-unvalidated-multimodal-embeddings	Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-56340
https://bugzilla.redhat.com/show_bug.cgi?id=2491060
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56340.json

Configurations

Configuration 1 (hide)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-06-20 19:16

Updated : 2026-07-15 01:16

NVD link : CVE-2026-56340

Mitre link : CVE-2026-56340

CVE.ORG link : CVE-2026-56340

JSON object : View

Products Affected

vllm

vllm

CWE

CWE-20

Improper Input Validation

NVD-CWE-noinfo CWE-787

Out-of-bounds Write

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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."}], "lastModified": "2026-07-15T01:16:38.343", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "69B9B776-8C9E-4BA9-94C9-2867AE83F571", "versionEndExcluding": "0.13.0", "versionStartIncluding": "0.10.2"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}