PyPI/vllm CVE-2026-34756: medium 6.5, EPSS 0.42%

vLLM: Unauthenticated OOM Denial of Service via Unbounded `n` Parameter in OpenAI API Server

Action: Upgrade vllm to 0.19.0 or later.

pip install vllm==0.19.0

Affected

Fixed versions

Sources

• osv: GHSA-3mwp-wvh9-7528
• https://github.com/vllm-project/vllm/security/advisories/GHSA-3mwp-wvh9-7528
• https://nvd.nist.gov/vuln/detail/CVE-2026-34756
• https://github.com/vllm-project/vllm/pull/37952
• https://github.com/vllm-project/vllm/commit/b111f8a61f100fdca08706f41f29ef3548de7380
• https://access.redhat.com/errata/RHSA-2026:36005
• https://access.redhat.com/errata/RHSA-2026:36006
• https://access.redhat.com/security/cve/CVE-2026-34756
• https://bugzilla.redhat.com/show_bug.cgi?id=2455425
• https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2026-2298.yaml
• https://github.com/vllm-project/vllm
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34756.json

CVE-2026-34756 · published 2026-04-03T15:35:48Z · modified 2026-09-10T03:50:42.430496411Z · JSON