Redash: Arbitrary file read and write through DuckDB query runner
Summary
Redash, an open-source tool for data visualization and sharing, does not disable external access in the DuckDB query runner by default. A user with query access to a DuckDB data source created by an administrator can use native file-reading functions to read files the Redash process can access, or use COPY TO to write files with its privileges. Reading application secrets such as REDASH_COOKIE_SECRET or REDASH_SECRET_KEY could also enable forged sessions and authentication bypass.
Affected
- Redash versions from 26.0.0 up to, but not including, 26.9.0
- Sources conflict on the start of the range: the CNA record says 26.0.0, while OSV marks all earlier commits as affected. Treat all versions before 26.9.0 as affected.
Fixed in
- Fixed in Redash 26.9.0
- Fix commit: 7387072af40913a64e7b3be470491792f2d5551c
Workaround
- Unknown. The vendor does not describe a workaround for affected versions.
- Interim measure (not from the vendor): remove or restrict DuckDB data sources and limit query access to trusted administrators.
Exploitation
- CISA SSVC lists exploitation as PoC and automatable as no.
- No evidence of exploitation in the wild was found. The CISA KEV catalogue was not checked directly.
- EPSS is low (0.00525 in one source).
Our recommendation
- Upgrade all Redash instances to version 26.9.0 or later, starting with shared installations.
- Identify all Redash instances and their versions, and check whether they are reachable from the internet.
- Until patched, restrict DuckDB data sources and query access to trusted users.
- After patching, rotate REDASH_SECRET_KEY and REDASH_COOKIE_SECRET if exposure before the update cannot be ruled out.
- The vendor rates this advisory as Medium, while the CNA score is 9.3. Prioritise the patch anyway, because low-privilege users can reach server files and secrets.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- GitHub Security Advisory GHSA-cr68-3xxj-cg9f github.com
- Redash Release v26.9.0 github.com
- Redash fix commit 7387072 github.com
- OSV CVE-2026-77371 osv.dev
- VulDB 420289 vuldb.com
- OpenCVE CVE-2026-77371 app.opencve.io
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 31 Oct 2026, 01:46.
Original description (NVD)
Redash is a package for data visualization and sharing. From 26.0.0 until 26.9.0, the DuckDB query runner's _connect() path in redash/query_runner/duckdb.py created connections with enable_external_access left at its default value of true. A user with query access to an administrator-created DuckDB data source could use native file-reading functions to retrieve files readable by the Redash process or use COPY TO to write files with that process's privileges. Reading application secrets such as REDASH_COOKIE_SECRET or REDASH_SECRET_KEY could also enable forged sessions and authentication bypass. This issue is fixed in version 26.9.0.
NVD references (4)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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