CVE-2026-45829Public exploitNetwork attack vector

Pre-auth code execution via premature model loading

Published May 18, 2026 · Updated May 18, 2026

Code injection in ChromaDB's Python FastAPI server 1.0.0 and later allows remote attackers to execute arbitrary code without authentication. The create_collection handler instantiates client-supplied embedding configuration before its authorization check and passes trust_remote_code to AutoModel.from_pretrained(). Any network path to the Python server is sufficient; a controlled Hugging Face model repository executes with the server process's access, while the default Rust server is unaffected.

CVSS severity10.0
Critical
EPSS probability12.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in ChromaDB's Python FastAPI server 1.0.0 and later allows remote attackers to execute arbitrary code without authentication. The create_collection handler instantiates client-supplied embedding configuration before its authorization check and passes trust_remote_code to AutoModel.from_pretrained(). Any network path to the Python server is sufficient; a controlled Hugging Face model repository executes with the server process's access, while the default Rust server is unaffected.

The record

CVE
CVE-2026-45829
Published
May 18, 2026
Updated
May 18, 2026
Vendor
Chroma
Product
ChromaDB
Classifications
CWE-502, CWE-94, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 18, 2026CVE publishedPublication date reported by the CVE source.
  2. May 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chroma · ChromaDBversion=1.0.0 <=*

Published CVSS scores

10.0Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
9.3GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
10.0HiddenLayerCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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