CVE-2026-85525 Improper OCSP response validation in Snowflake drivers
Man-in-the-middle attackers can bypass OCSP validation to intercept and modify data in Snowflake driver connections using revoked certificates.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-85525?
CVE-2026-85525 is a high-severity vulnerability in Snowflake Connector for Python, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Improper OCSP response validation in the Snowflake Python, Go, JDBC, and Node.js drivers allowed a revoked TLS certificate to be accepted as valid, because OCSP responses were not reliably bound to the certificate being validated and definitive verification failures were treated as transient. A man-in-the-middle attacker holding a revoked certificate and its private key for a Snowflake or stage hostname could cause the driver to establish a TLS session to the attacker-controlled endpoint anyway, allowing the attacker to read and modify data transmitted within that connection. Successful exploitation requires that on-path position and the corresponding private key, and impact is limited to data carried within the intercepted connection. The fix is available in Snowflake Connector for Python v4.7.3, Snowflake Go Driver v2.2.0, Snowflake JDBC Driver v4.3.4 (including the snowflake-jdbc-fips and snowflake-jdbc-thin), and Snowflake Node.js Driver v3.3.0. Users must manually upgrade.
Which versions are affected by CVE-2026-85525?
How do I fix CVE-2026-85525?
Upgrade to a fixed version.
Is CVE-2026-85525 being exploited?
There is no known exploitation of CVE-2026-85525 in the wild and no public exploit code.
Sources
Also known as CLEANSTART-2026-LK90655, CLEANSTART-2026-QV01130, CLEANSTART-2026-UC39319, CLEANSTART-2026-XJ29486, CLEANSTART-2026-YH75013, GHSA-h6vc-8q8q-7wvw.