Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-73558

CVE-2026-73558MEDIUM

vllm-project vllm — vLLM: Cross-User Data Leak Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   H   N   R  U  H  N  N    5.3   .0041   33.4     —

AFFECTED
  Product  Versions    Fixed
  vllm     < 0.27.0 –  —

TIMELINE
  Aug 12  Reserved by GitHub_M
  Aug 13  Published (CNA: GitHub_M)
  Sep 28  EXPLOIT PUBLISHED — CVE-2026-73558 (vllm-project vllm). Public exploit reference added.

CWE-190 · CNA: GitHub_M · CVSS v3.1 · 5 references · NVD status: Analyzed

Description

vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
August 12, 2026	Reserved	Reserved by GitHub_M
August 13, 2026	Published	Published (CNA: GitHub_M)
September 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-73558 (vllm-project vllm). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
vllm-project	vllm	—	< 0.27.0	—

Weaknesses

CWE-190

References (5)

https://github.com/vllm-project/vllm/commit/451227cb3ff07989698fed982c2d3e4300257924 [Patch]
https://github.com/vllm-project/vllm/issues/42860 [Issue Tracking, Patch]
https://github.com/vllm-project/vllm/pull/49660 [Issue Tracking, Patch]
https://github.com/vllm-project/vllm/releases/tag/v0.27.0 [Release Notes]
https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5 [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-73558 at cve.org

Vendors: vllm-project

Weaknesses: CWE-190

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-73558 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.