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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-41523

34
FAUCET Score

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.

First published: Jun 22, 2026Last modified: Jun 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.22.0CPE matchmatch criteria
cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.75%
Probability of exploitation in next 30 days
EPSS Percentile
51.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0075 is in the 41st percentile among its peer group of 1,572 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: vllmFixed in: 0.22.0

Vendor Advisories (1)

pipGHSA-q8gq-377p-jq3rhigh

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

Jun 16, 2026

References

access.redhat.com / errata/RHSA-2026:36005
access.redhat.com / errata/RHSA-2026:36006
access.redhat.com / security/cve/CVE-2026-41523
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-41523.json
github.com / vllm-project/vllm/commit/b3c7ffcab82c2439726f8cb213800f6f38c023d3
Patch
github.com / vllm-project/vllm/security/advisories/GHSA-q8gq-377p-jq3r
ExploitThird Party Advisory
huntr.com / bounties/dcb05b04-e625-41e7-adbc-bbae0cc2d64c
Third Party Advisory