5.3

CVE-2026-73555: vllm-project vllm

CVSS: 5.3v3.1MediumAnalyzed
AliasesGHSA-hwrm-c4cx-rf4jPYSEC-2026-3937CGA-4j5w-cwp9-gvr9
Published 13-08-2026Last modified 14-08-2026
Open JSON

Vulnerability summary

CVE-2026-73555 is a medium (CVSS 5.3) vulnerability in vllm-project vllm. EPSS estimates a 0.41% chance of exploitation in the next 30 days, higher than 34.3% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.41%
0%100%
Low · +0.16 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 13-08-2026
    PublishedVulnerability first disclosed.
  2. 14-08-2026
    Last modifiedVulnerability information updated.

Description

vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the validation_exception_handler in vllm/entrypoints/openai/server_utils.py converts FastAPI RequestValidationError objects with str(exc), and sanitize_message in vllm/entrypoints/utils.py does not remove traceback-style file paths, allowing unauthenticated malformed JSON requests to /v1/chat/completions, /v1/completions, /tokenize, and /detokenize to disclose the OS username, home and virtual-environment paths, Python version, internal package structure, line numbers, and endpoint handler names. This issue is fixed in version 0.26.0.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.41%

Chance of exploitation in the next 30 days

Percentile

34%

Versus all other CVEs

30-day change

+0.16 pp

From 0.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.41%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard5 products
  • kserve-huggingfaceserver-cuda-13.3All versions (No fix recorded)
  • lmcache-cuda-12.8All versions (No fix recorded)
  • nemo-rl-cuda-13.0-vllmAll versions (No fix recorded)
  • py3.10-vllm-cuda-12.4All versions (No fix recorded)
  • py3.12-vllm-cuda-12.4All versions (No fix recorded)
PyPI1 product
  • vllm< 0.26.0
Vllm1 product
Vllm-project1 product

4 vendors · 8 products

References

9 links