CVE-2020-26759 json
Arbitrary code execution in clickhouse-driver
published 2021-01-06 5 y ago modified 2026-09-08 2 mo ago also BIT-clickhouse-2020-26759 , EUVD-2021-0043 , GHSA-vgv5-cxvh-vfxh , PYSEC-2021-61
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.7%
- EPSS 2.7% chance of exploitation in 30 days, percentile 85%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- pypi clickhouse-driver 0.1.5
- bitnami clickhouse 0.1.5
- clickhouse-driver_project clickhouse-driver 0.1.5
- python-clickhouse-driver Debian 14, Debian 13, Debian 12 0.2.0-1
debian advisories DEBIAN-CVE-2020-26759
Exploit prediction
2.69% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | clickhouse-driver | <0.1.5 |
0.1.5 |
| bitnami | clickhouse | <0.1.5 |
0.1.5 |
Classification
- Weakness
-
- CWE-120 Buffer Copy without Checking Size of Input
References
-
github.com
/mymarilyn/clickhouse-driver/commit/d708ed548e1d6f254ba81a21de8ba543a53b5598
web, patch, third-party-advisory, advisory
-
github.com
/mymarilyn/clickhouse-driver/commit/3e990547e064b8fca916b23a0f7d6fe8c63c7f6b
web, patch, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-26759
advisory, web
-
github.com
/advisories/GHSA-vgv5-cxvh-vfxh
advisory
-
github.com
/mymarilyn/clickhouse-driver
package
-
github.com
/pypa/advisory-database/tree/main/vulns/clickhouse-driver/PYSEC-2021-61.yaml
web
Sources
- CVE List CVE-2020-26759
- GitHub Advisory GHSA-vgv5-cxvh-vfxh
- NVD CVE-2020-26759
- OSV BIT-clickhouse-2020-26759
- OSV PYSEC-2021-61
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.