CVE-2023-48704: Unauthenticated heap buffer overflow in Gorrila codec decompression

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-22 · updated 2026-06-17
Weakness: CWE-120

Description

ClickHouse is an open-source column-oriented database management system that allows generating analytical data reports in real-time. A heap buffer overflow issue was discovered in ClickHouse server. An attacker could send a specially crafted payload to the native interface exposed by default on port 9000/tcp, triggering a bug in the decompression logic of Gorilla codec that crashes the ClickHouse server process. This attack does not require authentication. This issue has been addressed in ClickHouse Cloud version 23.9.2.47551 and ClickHouse versions 23.10.5.20, 23.3.18.15, 23.8.8.20, and 23.9.6.20.

Affected products

ClickHouse: from 23.3 before 23.3.18.15; from 23.8 before 23.8.8.20; from 23.9 before 23.9.6.20; from 23.10 before 23.10.5.20 — fixed in 23.10.5.20, 23.3.18.15, 23.8.8.20, 23.9.6.20
Clickhouse Cloud: before 23.9.2.47551 — fixed in 23.9.2.47551

How to fix

Upgrade to a fixed version: ClickHouse 23.10.5.20, 23.3.18.15, 23.8.8.20, 23.9.6.20; Clickhouse Cloud 23.9.2.47551. Check the vendor advisory for mitigations.

References

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