chroma-core Chroma up to 1.5.9 HNSW Index max_neighbors/ef_construction/ef_search input validation

Summaryinfo

A vulnerability has been found in chroma-core Chroma up to 1.5.9 and classified as problematic. This affects an unknown function of the component HNSW Index. Performing a manipulation of the argument max_neighbors/ef_construction/ef_search results in input validation. This vulnerability is known as CVE-2026-85664. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability classified as problematic has been found in chroma-core Chroma up to 1.5.9. This affects an unknown part of the component HNSW Index. The manipulation of the argument max_neighbors/ef_construction/ef_search with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. The summary by CVE is:

Chroma 1.5.9 fails to validate maximum bounds on HNSW index parameters max_neighbors, ef_construction, and ef_search in collection-create requests. Unauthenticated attackers can supply arbitrarily large parameter values to exhaust server memory and cause denial of service during index compaction.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-85664 since 09/04/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• chroma-core

Name

• Chroma

Version

• 1.5.0
• 1.5.1
• 1.5.2
• 1.5.3
• 1.5.4
• 1.5.5
• 1.5.6
• 1.5.7
• 1.5.8
• 1.5.9

Website

• Product: https://github.com/chroma-core/chroma/

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