CVE-2020-26759

Name: CVE-2020-26759
Creator: NVD / NIST
Published: 2021-01-06T13:15:13.783+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 2.56%

Last modified Jun 17, 2026

CVE-2020-26759 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.. EPSS estimates a 2.56% chance of exploitation in the next 30 days.

Description

clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

2.56%

83.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-120

Affected Software

Vendor	Product	Versions
Clickhouse-Driver Project	Clickhouse-Driver	< 0.1.5

References

https://github.com/mymarilyn/clickhouse-driver/commit/3e990547e064b8fca916b23a0f7d6fe8c63c7f6bPatch, Third Party Advisory
https://github.com/mymarilyn/clickhouse-driver/commit/d708ed548e1d6f254ba81a21de8ba543a53b5598Patch, Third Party Advisory
https://github.com/mymarilyn/clickhouse-driver/commit/3e990547e064b8fca916b23a0f7d6fe8c63c7f6bPatch, Third Party Advisory
https://github.com/mymarilyn/clickhouse-driver/commit/d708ed548e1d6f254ba81a21de8ba543a53b5598Patch, Third Party Advisory

Timeline

Published: Jan 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26759?

clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary code (on a database client) via a crafted server response, due to a buffer overflow.

How severe is CVE-2020-26759?

CVE-2020-26759 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 2.56% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26759?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26759?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST