CVE-2026-85664CWE-770denial-of-service

CVE-2026-85664

High · published September 4, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
50.9
In the wild
Unconfirmed
What it 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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00658 · 50.9th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-09-04T19:17Z
References (5)
https://github.com/chroma-core/chroma · [email protected]https://github.com/chroma-core/chroma/blob/1.5.9/rust/frontend/src/auth/mod.rs · [email protected]https://github.com/chroma-core/chroma/blob/1.5.9/rust/types/src/hnsw_configuration.rs · [email protected]https://github.com/chroma-core/chroma/issues/7225 · [email protected]https://www.vulncheck.com/advisories/chroma-1.5.9-unbounded-hnsw-index-parameters-memory-exhaustion · [email protected]
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 04 SEP 14:32Z
    Chroma 1.5.9 Unbounded HNSW Index Parameters Memory Exhaustion
    cvelistv5