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Fencer Vulns
high 8.2

CVE-2026-86600 json

Workload identity attestation generated before login host validation in Snowflake drivers

published 2026-09-08 2 mo ago modified 2026-09-10 59 d ago also EUVD-2026-72877

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

Summary

In affected Snowflake drivers, WORKLOAD_IDENTITY authentication requests a cloud workload-identity token and attaches it to the login request without verifying that the configured host is a Snowflake endpoint. An attacker who can modify the connection configuration can cause the driver to mint a fresh attestation and send it to a host they control. The captured token can be replayed to Snowflake for its remaining lifetime in accounts where that workload identity is already registered. On Azure, the token audience is also taken from connection configuration. Combined with an attacker-controlled host, the driver can request a Managed Identity access token scoped to a non-Snowflake Azure resource and deliver it to the attacker. That path is the only case in which impact extends beyond Snowflake; it is bounded by the token lifetime and the managed identity’s permissions. Successful exploitation requires WORKLOAD_IDENTITY authentication on a workload that already has an ambient cloud identity. Patched driver versions restrict this authenticator to recognized Snowflake hosts. Users must manually upgrade.

Patch / fix

  • Snowflake Snowflake Connector for Python 4.7.3
  • Snowflake Snowflake Go Driver 2.2.0
  • Snowflake Snowflake JDBC Driver 4.3.4
  • Snowflake Snowflake JDBC Driver (FIPS) 4.3.4
  • Snowflake Snowflake JDBC Driver (Thin) 4.3.4
  • Snowflake Snowflake Node.js Driver 3.3.0
  • Snowflake Snowflake Connector for .NET 6.1.0
  • Snowflake Snowflake ODBC Driver 3.20.0
  • Snowflake Snowflake PHP PDO Driver 4.2.0
  • Snowflake Snowflake Libsnowflakeclient 2.10.0

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected products

  • Snowflake Snowflake Connector for Python
  • Snowflake Snowflake Go Driver
  • Snowflake Snowflake JDBC Driver
  • Snowflake Snowflake JDBC Driver (FIPS)
  • Snowflake Snowflake JDBC Driver (Thin)
  • Snowflake Snowflake Node.js Driver
  • Snowflake Snowflake Connector for .NET
  • Snowflake Snowflake ODBC Driver
  • Snowflake Snowflake PHP PDO Driver
  • Snowflake Snowflake Libsnowflakeclient

Classification

Weakness
  • CWE-522 Insufficiently Protected Credentials
  • CWE-441 Unintended Proxy or Intermediary

References

Sources

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.