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CVE-2026-85664— Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion

Quick assessment

Affected
chroma-core chroma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Chroma 1.5.9 在 collection-create 请求中未能对 HNSW 索引参数 、 和 设置最大值的验证。未经身份验证的攻击者可以传入任意大的参数值，从而耗尽服务器内存，导致在索引压缩（compaction）过程中发生服务中断（拒绝服务攻击）。

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
chroma-core chroma ≤ 1.5.9 affected
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I. Basic Information for CVE-2026-85664

Vulnerability Information
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Vulnerability Title
Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
chroma-core chroma 0 ~ 1.5.9 -

II. Public POCs for CVE-2026-85664

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III. Intelligence Information for CVE-2026-85664

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Patches & Fixes for CVE-2026-85664 (2)

Vendor Advisories for CVE-2026-85664 (1)

Vendor Pages for CVE-2026-85664 (1)

Other References for CVE-2026-85664 (1)

IV. Related Vulnerabilities

Same product: chroma
Same weakness: CWE-770

V. Comments for CVE-2026-85664

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