CVE-2026-73555

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (33rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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 v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
39
EG Risk 39/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
33rd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

October 2, 2026

Advisory Details (4)

Auto-updated Aug 13, 2026
Patch available. Sources: github_commit, github_pr, github_release, github.
githubMentions a patch (unverified)

Unauthenticated Internal Path and Username Disclosure via Validation Error Messages · Advisory · vllm-project/vllm · GitHub

https://github.com/vllm-project/vllm/security/advisories/GHSA-hwrm-c4cx-rf4j
github_release Patch Available

v0.26.0

Patch available: vllm-project/vllm v0.26.0

https://github.com/vllm-project/vllm/releases/tag/v0.26.0
github_pr

Sanitize server file paths from validation error responses

Fix merged in vllm-project/vllm PR #46415 on 2026-07-09 — awaiting tagged release

https://github.com/vllm-project/vllm/pull/46415
github_commit

commit e87521626feb (vllm-project/vllm)

Fix landed in vllm-project/vllm commit e87521626feb — awaiting tagged release

https://github.com/vllm-project/vllm/commit/e87521626febe2763f997691d1599de4175f4324

Vendor Advisories for CVE-2026-73555(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
vllm0.0.1 ... 0.9.2 (92 versions)
  • every version up to 0.26.0: fixed in 0.26.0
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 42× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:13 UTCEPSS rescore
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  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-06 13:22 UTCEG score recompute
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  18. 2026-09-27 13:48 UTCEPSS rescore
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  20. 2026-09-26 15:59 UTCEPSS rescore
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  24. 2026-09-23 04:34 UTCEG score recompute
  25. 2026-09-22 04:14 UTCEG score recompute
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  1. 2026-09-21 21:09 UTCEPSS rescore
  2. 2026-09-21 03:34 UTCEG score recompute
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 02:52 UTCEG score recompute
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  6. 2026-09-18 19:28 UTCEPSS rescore
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  9. 2026-09-16 14:08 UTCEPSS rescore
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  11. 2026-09-16 01:07 UTCEG score recompute
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  13. 2026-09-13 23:22 UTCEG score recompute
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  15. 2026-09-12 15:02 UTCEPSS rescore
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  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-10 21:48 UTCEG score recompute
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  20. 2026-09-09 04:57 UTCEG score recompute
  21. 2026-09-08 22:01 UTCEPSS rescore
  22. 2026-09-07 18:11 UTCEG score recompute
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  24. 2026-09-06 13:48 UTCEPSS rescore
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  27. 2026-09-04 05:07 UTCEPSS rescore
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  30. 2026-09-02 13:09 UTCEG score recompute
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  35. 2026-08-31 09:48 UTCEG score recompute
  36. 2026-08-30 19:18 UTCEPSS rescore
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  39. 2026-08-30 01:22 UTCEPSS rescore
  40. 2026-08-29 07:40 UTCEG score recompute
  41. 2026-08-28 21:42 UTCEPSS rescore
  42. 2026-08-27 21:20 UTCEG score recompute
  43. 2026-08-27 14:25 UTCEPSS rescore
  44. 2026-08-26 21:01 UTCEG score recompute
  45. 2026-08-26 14:47 UTCEPSS rescore
  46. 2026-08-25 20:40 UTCEG score recompute
  47. 2026-08-25 13:49 UTCEPSS rescore
  48. 2026-08-24 20:07 UTCEG score recompute
  49. 2026-08-23 19:46 UTCEG score recompute
  50. 2026-08-23 00:19 UTCEPSS rescore
  51. 2026-08-22 19:27 UTCEG score recompute
  52. 2026-08-21 23:49 UTCEPSS rescore
  53. 2026-08-21 19:07 UTCEG score recompute
  54. 2026-08-20 22:56 UTCEPSS rescore
  55. 2026-08-19 18:27 UTCEG score recompute
  56. 2026-08-19 17:04 UTCEPSS rescore
  57. 2026-08-18 18:06 UTCEG score recompute
  58. 2026-08-18 13:49 UTCEPSS rescore
  59. 2026-08-18 13:49 UTCEPSS rescore
  60. 2026-08-17 17:32 UTCEG score recompute
  61. 2026-08-17 13:47 UTCEPSS rescore
  62. 2026-08-16 17:12 UTCEG score recompute
  63. 2026-08-16 14:56 UTCEPSS rescore
  64. 2026-08-16 14:56 UTCEPSS rescore
  65. 2026-08-16 02:15 UTCEPSS rescore
  66. 2026-08-15 16:52 UTCEG score recompute
  67. 2026-08-15 01:31 UTCEPSS rescore
  68. 2026-08-14 16:32 UTCEG score recompute
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  70. 2026-08-13 15:23 UTCEG score recompute
  71. 2026-08-13 15:12 UTCEG score recompute
  72. 2026-08-13 15:11 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-73555?
CVE-2026-73555 is a medium vulnerability published on August 13, 2026. vLLM is an inference and serving engine for large language models. Prior to 0.26.0, the validationexceptionhandler in vllm/entrypoints/openai/serverutils.py converts FastAPI RequestValidationError objects with str(exc), and sanitizemessage in vllm/entrypoints/utils.py does not remove…
When was CVE-2026-73555 disclosed?
CVE-2026-73555 was first published on August 13, 2026, with the most recent update on October 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73555 actively exploited?
CVE-2026-73555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (33rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73555?
CVE-2026-73555 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73555?
A fix for CVE-2026-73555 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-73555 are linked in the Vendor Advisories panel on this page.

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