PatchTheCVECVE-2020-26759: clickhouse-driver before 0.1.5 allows a malicious clickhouse server to trigger a crash or execute arbitrary co
CVE-2020-26759 is a critical-severity flaw (CVSS 9.8) affecting clickhouse-driver. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 2.7% (top 14%) |
| CISA exploited list | No |
| Weakness | CWE-120 |
| Published | 2021-01-06 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2020-26759?
clickhouse-driver: upgrade to 0.1.5. Exact commands for each OS are on this page.
Is CVE-2020-26759 being exploited?
CVE-2020-26759 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2020-26759 affect?
CVE-2020-26759 affects clickhouse-driver. Severity is critical (CVSS 9.8). 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 urgent is CVE-2020-26759?
Priority 61/100. Critical severity; Remotely exploitable, no login, no user action