CVE-2026-45831: The SimpleRBACAuthorizationProvider authorization provider in versions 0.5.0 or later of the ChromaDB Python p

Q: How do I fix CVE-2026-45831?

chromadb: upgrade to newer than 1.5.9. Exact commands for each OS are on this page.

Q: Is CVE-2026-45831 being exploited?

CVE-2026-45831 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-45831 affect?

CVE-2026-45831 affects chromadb. Severity is high (CVSS 8.8). The SimpleRBACAuthorizationProvider authorization provider in versions 0.5.0 or later of the ChromaDB Python project evaluates whether a user holds a given permission but never checks which tenant, database, or collection that permission ap

Routine

HIGH 8.8UPGRADE

CVE-2026-45831 is a high-severity flaw (CVSS 8.8) affecting chromadb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The SimpleRBACAuthorizationProvider authorization provider in versions 0.5.0 or later of the ChromaDB Python project evaluates whether a user holds a given permission but never checks which tenant, database, or collection that permission applies to allowing users to perform cross tenant actions.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-06-12
Last modified	2026-10-26

Publisher (CNA): HiddenLayer · Vendor: trychroma

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 16:16 UTCPublished CVE record published
2026-10-26 11:10 UTCUpdated Record last modified

trychroma chromadb UPGRADE

Affected: >= 0.5.0 and <= 1.5.9

Fixed in: newer than 1.5.9

Safe to downgrade to: a release before 0.5.0

1. Check installed version

pip show chromadb

2. UPGRADE to newer than 1.5.9

pip install --upgrade "chromadb>1.5.9"

3. If no update is available yet, DOWNGRADE to a release before 0.5.0

pip index versions chromadb pip install "chromadb<0.5.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45831?

chromadb: upgrade to newer than 1.5.9. Exact commands for each OS are on this page.

Is CVE-2026-45831 being exploited?

CVE-2026-45831 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45831 affect?

CVE-2026-45831 affects chromadb. Severity is high (CVSS 8.8). The SimpleRBACAuthorizationProvider authorization provider in versions 0.5.0 or later of the ChromaDB Python project evaluates whether a user holds a given permission but never checks which tenant, database, or collection that permission ap

How urgent is CVE-2026-45831?

Priority 34/100. High severity

Software pages

Python vulnerabilities

Related CVEs

CVE-2026-45830 HIGH 8.8 UPGRADE A lack of authorization validation in version 0.4.17 or later of the ChromaDB Python project allows any authen
CVE-2026-45833 HIGH 8.8 UPGRADE A code injection vulnerability in version 0.4.17 or later of the ChromaDB Python project allows an authenticat
CVE-2026-45832 HIGH 8.8 UPGRADE All V1 collection-level endpoints in ChromaDB's Python project pass None for the tenant and database to the au

References

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