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CVE-2026-45831 Chroma CVE debrief

CVE-2026-45831 is a HIGH severity vulnerability in the ChromaDB Python Project's SimpleRBACAuthorizationProvider. The vulnerability has a CVSS score of 8.8. The SimpleRBACAuthorizationProvider authorization provider in versions 0.5.0 or later 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.

Vendor
Chroma
Product
ChromaDB
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-16
Advisory published
2026-06-12
Advisory updated
2026-06-16

Who should care

Users of ChromaDB Python Project's SimpleRBACAuthorizationProvider, particularly those using versions 0.5.0 or later, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The SimpleRBACAuthorizationProvider authorization provider in ChromaDB Python Project versions 0.5.0 or later has a vulnerability that allows users to perform cross-tenant actions. This is because the provider evaluates whether a user holds a given permission but never checks which tenant, database, or collection that permission applies to.

Defensive priority

HIGH

Recommended defensive actions

  • Update to a patched version of ChromaDB Python Project's SimpleRBACAuthorizationProvider, if available.
  • Implement additional access controls to restrict cross-tenant actions.

Evidence notes

The vulnerability was reported by Hiddenlayer.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-45831 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-45831

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-45831 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-45831

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.hiddenlayer.com/sai-security-advisory/2026-06-chromadb-3

    6f8de1f0-f67e-45a6-b68f-98777fdb759c

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.