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No exploitation reportedFix available

CVE-2026-100652

No exploitation reported by the sources we read.

  • Published2026-09-26
  • Fixed in0.24.0
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures that leave EngineCore in a fatal state requiring service restart.

Timeline

dates in UTC
  1. 2026-09-2614:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-100652?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-100652?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Vllm
BranchAffectedFixed in
0.x≥ 0.22.0, < 0.24.00.24.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2026-100652 Red Hat Product Security16 products fixed · 22 known affected

    vllm: vLLM: Denial of Service via out-of-bounds stop token IDs

    rhaii/vllm-cpu-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-cuda-rhel9 as a component of Red Hat AI Inference Server · rhaii/vllm-gaudi-rhel9 as a component of Red Hat AI Inference Server · +19 more

  • RHSA-2026:84734 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: RHOAI 3.4.5 - Red Hat OpenShift AI

Full record on NVD

Fix

  1. Update Vllm to 0.24.0
  2. Vendor fix Red Hat Product Security RHSA-2026:84734 · 16 productsFor Red Hat OpenShift AI 3.4.5 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:84734 · 321 productsRestrict network access to vLLM HTTP and gRPC service endpoints to trusted networks and authenticated clients only. In host-based environments, restrict the serving port (typically TCP port 8000) using firewalld: ``` firewall-cmd --permanent --zone=trusted --add-source=<trusted_ip_or_subnet> fire…
  4. No fix available, says the vendor Red Hat Product Security CVE-2026-100652 · 13 productsAffected
  5. No fix planned, says the vendor Red Hat Product Security CVE-2026-100652 · 9 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • CISA-ADPSSVC decisionnone2026-09-28
  • OpenCVESSVC decisionnone—
  • CNACVSS 4.08.2read 2026-10-23
  • CNACVSS 3.15.9read 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-20read 2026-10-23
  • FIRST EPSSEPSS score0.4 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-09-26
Last Modified
2026-10-06
NVD status
Analyzed

Frequently asked questions

What is CVE-2026-100652?

vLLM versions 0.22.0 through 0.23.0 fail to validate stop_token_ids against vocabulary bounds in Rust HTTP and gRPC frontends, allowing out-of-vocabulary token IDs to reach MinTokensLogitsProcessor. Attackers can submit requests with min_tokens greater than zero and out-of-vocabulary stop_token_ids to trigger CUDA tensor indexing failures that leave EngineCore in a fatal state requiring service restart.

Is CVE-2026-100652 actively exploited?

Active exploitation of CVE-2026-100652 has not been confirmed. Its EPSS score was 0.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-100652?

CVE-2026-100652 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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