gcdRadar
archive/Patch now/AIR-2026-1947
closedclosed 13 Nov 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-126398: vLLM reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions

vLLM

vLLM contains a reachable assertion vulnerability allowing remote attackers to crash the engine via specific embeddings-only requests. Attackers can terminate the EngineCore and API server for all connected clients.

why this severityDisclosed vulnerability with a fix and no confirmed exploitation.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
8.2
EPSS
<0.01 · top 58% · 2026-11-13
EPSS scores by FIRST
fix status
Patched
affected
vLLM >= 0.28.0, < 0.30.0
fixed in
vLLM 0.30.0
first report
13 Nov 2026
last update
13 Nov 2026
CVE ids
CVE-2026-126398other records

What to do

Update vLLM to version 0.30.0 or later.

Timeline · 1

  1. 13 Nov 2026CVE-2026-126398: vLLM from 0.28.0 before 0.30.0 contains a reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions that allows…

Sources · 1

Advisories and databases

  1. 2026-11-13
    CVE-2026-126398: vLLM from 0.28.0 before 0.30.0 contains a reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions that allows…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-126398

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Patched
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
denial-of-serviceassertion-failure
dates
happened 13 Nov 2026 · first reported 13 Nov 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-11-13 11:16Z · updated 2026-11-13 11:16Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-126398: vLLM reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions

https://gcdradar.vercel.app/incidents/cve-2026-126398-vllm-reachable-assertion-vulnerability-in-gp · AIR-2026-1947 · closed 2026-11-13

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability): Disclosed vulnerability with a fix and no confirmed exploitation.
- Fix status: Patched
- First reported: 2026-11-13
- AI role: Attack on AI
- Products: vLLM
- CVE ids: CVE-2026-126398
- CVSS: 8.2

## Summary

vLLM contains a reachable assertion vulnerability allowing remote attackers to crash the engine via specific embeddings-only requests. Attackers can terminate the EngineCore and API server for all connected clients.

## What to do

Update vLLM to version 0.30.0 or later.

## Affected and fixed versions

- Affected: vLLM >= 0.28.0, < 0.30.0
- Fixed in: vLLM 0.30.0

## Latest updates

- 2026-11-13: CVE-2026-126398: vLLM from 0.28.0 before 0.30.0 contains a reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions that allows… (https://nvd.nist.gov/vuln/detail/CVE-2026-126398)

## Sources

- 2026-11-13 NVD: CVE-2026-126398: vLLM from 0.28.0 before 0.30.0 contains a reachable assertion vulnerability in GPUModelRunner._init_xdrope_positions that allows… https://nvd.nist.gov/vuln/detail/CVE-2026-126398

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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