# vLLM deserialization vulnerability leading to DoS and potential RCE

Advisory record · `GHSA-mrw7-hf4f-83pf`

- **Identifiers:** `GHSA-mrw7-hf4f-83pf` · `CVE-2025-62164` · `PYSEC-2026-2018`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) · [CWE-123](https://cwe.mitre.org/data/definitions/123.html) · [CWE-502](https://cwe.mitre.org/data/definitions/502.html) · [CWE-787](https://cwe.mitre.org/data/definitions/787.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md) · [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md) · [CWE-123](https://agentprime.io/advisories/tag/cwe-123.md)
- **Published:** 20 Nov 2025
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Nov 2025, 20:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `vllm` (PyPI): affected `>=0.10.2, <0.11.1`; fixed in `0.11.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The vllm package versions 0.10.2 up to but not including 0.11.1 are affected. A user with access to the Completions API endpoint can submit crafted prompt embedding tensors that trigger an out-of-bounds memory write during deserialization, which can crash the server and may lead to remote code execution. Upgrade vllm to version 0.11.1 or later.

Written 4 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.8 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0096, the 61st percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:29 UTC: First seen by agentprime
- 31 Oct 2026, 14:29 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-mrw7-hf4f-83pf)

## Sources

- [GitHub Advisory Database: GHSA-mrw7-hf4f-83pf](https://github.com/advisories/GHSA-mrw7-hf4f-83pf)
- [OSV: GHSA-mrw7-hf4f-83pf](https://osv.dev/vulnerability/GHSA-mrw7-hf4f-83pf)
- <https://github.com/vllm-project/vllm/security/advisories/GHSA-mrw7-hf4f-83pf>
- <https://nvd.nist.gov/vuln/detail/CVE-2025-62164>
- <https://github.com/vllm-project/vllm/pull/27204>
- <https://github.com/vllm-project/vllm/commit/58fab50d82838d5014f4a14d991fdb9352c9c84b>
- <https://github.com/advisories/GHSA-mrw7-hf4f-83pf>
- <https://github.com/pypa/advisory-database/tree/main/vulns/vllm/PYSEC-2026-2018.yaml>
- <https://github.com/vllm-project/vllm>
- <https://pypi.org/project/vllm>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-mrw7-hf4f-83pf>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-mrw7-hf4f-83pf/>. Everything for agents: <https://agentprime.io/llms.txt>.