Vulnerability-Lookup

FKIE_CVE-2026-41523

Vulnerability from fkie_nvd - Published: 2026-06-22 23:16 - Updated: 2026-09-04 13:19

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.22.0, an assert-based security check in vLLM's activation function loading allows any unauthenticated attacker to achieve arbitrary code execution on the server by publishing a malicious HuggingFace model, when vLLM runs in Python optimized mode (python -O or PYTHONOPTIMIZE=1). This vulnerability is fixed in 0.22.0.

References

URL	Tags
security-advisories@github.com	https://github.com/vllm-project/vllm/commit/b3c7ffcab82c2439726f8cb213800f6f38c023d3	Patch
security-advisories@github.com	https://github.com/vllm-project/vllm/security/advisories/GHSA-q8gq-377p-jq3r	Exploit, Third Party Advisory
security-advisories@github.com	https://huntr.com/bounties/dcb05b04-e625-41e7-adbc-bbae0cc2d64c	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36005
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36006
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:57380
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:57387
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:57389
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:57390
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:59138
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:59139
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:59144
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:59151
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:61627
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:61629
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:62335
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:62336
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-41523
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2491582
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41523.json

Impacted products

	Vendor	Product	Version
	vllm	vllm	*

JSON

To clipboard

{
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      "value": "vLLM is an inference and serving engine for large language models (LLMs). Prior to 0.22.0, an assert-based security check in vLLM\u0027s activation function loading allows any unauthenticated attacker to achieve arbitrary code execution on the server by publishing a malicious HuggingFace model, when vLLM runs in Python optimized mode (python -O or PYTHONOPTIMIZE=1). This vulnerability is fixed in 0.22.0."
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  "lastModified": "2026-09-04T13:19:41.473",
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CVE-2026-41523 (GCVE-0-2026-41523)

Vulnerability from cvelistv5 – Published: 2026-06-22 22:18 – Updated: 2026-09-04 12:04

Title

vLLM: Security Check Bypass via assert Statement in Activation Function Loading Allows Arbitrary Code Execution

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-23 12:23 UTC

CWE

CWE-94 - Improper Control of Generation of Code ('Code Injection')
CWE-617 - Reachable Assertion

Assigner

GitHub_M mitre root

References

20 references

URL	Tags
https://github.com/vllm-project/vllm/security/adv…	x_refsource_CONFIRM
https://github.com/vllm-project/vllm/commit/b3c7f…	x_refsource_MISC
https://huntr.com/bounties/dcb05b04-e625-41e7-adb…	x_refsource_MISC
https://access.redhat.com/security/cve/CVE-2026-41523	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2491582	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:61627	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36005	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:61629	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:36006	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59138	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59139	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57380	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57389	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57390	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:57387	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62336	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:62335	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59151	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:59144	vendor-advisoryx_refsource_REDHAT

Impacted products

24 products

Vendor	Product	Version
vllm-project	vllm	Affected: < 0.22.0
Red Hat	Red Hat AI Inference Server 3.2	Unaffected: 1782951012 , < * (rpm) Unaffected: 1787860580 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.2::el9
Red Hat	Red Hat AI Inference Server 3.2	Unaffected: 1782951244 , < * (rpm) Unaffected: 1787884873 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.2::el9
Red Hat	Red Hat AI Inference Server 3.3	Unaffected: 1787161382 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.3::el9
Red Hat	Red Hat AI Inference Server 3.3	Unaffected: 1787161803 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.3::el9
Red Hat	Red Hat AI Inference Server 3.4	Unaffected: 1787151769 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.4::el9
Red Hat	Red Hat AI Inference Server 3.4	Unaffected: 1787151840 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.4::el9
Red Hat	Red Hat AI Inference Server 3.4	Unaffected: 1787151771 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.4::el9
Red Hat	Red Hat AI Inference Server 3.4	Unaffected: 1787151774 , < * (rpm) cpe:/a:redhat:ai_inference_server:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788290314 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788273908 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788273909 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788260684 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788273977 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.3	Unaffected: 1788260620 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.3::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787310717 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787253912 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787253989 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787254059 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787243961 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787253774 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat Enterprise Linux AI 3.4	Unaffected: 1787244006 , < * (rpm) cpe:/a:redhat:enterprise_linux_ai:3.4::el9
Red Hat	Red Hat AI Inference Server	cpe:/a:redhat:ai_inference_server:3
Red Hat	Red Hat OpenShift AI (RHOAI)	cpe:/a:redhat:openshift_ai

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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FKIE_CVE-2026-41523

CVE-2026-41523 (GCVE-0-2026-41523)

Tags

Sightings

Nomenclature

Related by attack behaviour