{"id":"CVE-2026-41523","aliases":["GHSA-q8gq-377p-jq3r","PYSEC-2026-2300"],"url":"https://o3.security/vulnerability/CVE-2026-41523","summary":"vLLM: Security Check Bypass via assert Statement in Activation Function Loading Allows Arbitrary Code Execution","details":"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.","published":"2026-06-22T22:18:14.494Z","modified":"2026-08-12T03:51:46.419283025Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":{"score":0.00746,"percentile":0.51391,"asOf":"2026-08-10"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"vllm","fixedVersion":"0.22.0"}],"fix":{"url":"https://github.com/vllm-project/vllm/commit/b3c7ffcab82c2439726f8cb213800f6f38c023d3","label":"vllm-project/vllm@b3c7ffc"},"references":[{"type":"WEB","url":"https://huntr.com/bounties/dcb05b04-e625-41e7-adbc-bbae0cc2d64c"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-41523.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36005"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36006"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-41523"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41523.json"},{"type":"ADVISORY","url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-q8gq-377p-jq3r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-41523"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491582"},{"type":"FIX","url":"https://github.com/vllm-project/vllm/commit/b3c7ffcab82c2439726f8cb213800f6f38c023d3"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:46.419283025Z"}}