Malicious code in Tessa.Postgre.Sql (NuGet)
Malicious code was discovered in the Tessa.Postgre.Sql NuGet package. The incident was identified and reported by the OpenSSF malicious packages project.
- Disclosed
- Last updated
- Blast radius
- Unknown; depends on adoption of affected versions
- Ecosystems
- Attack vectors
- Affected entities
- Tessa.Postgre.SqlNuGet package
A malicious code injection was identified in the Tessa.Postgre.Sql package distributed via NuGet. The package was flagged as containing malicious code and cataloged in the OpenSSF's malicious packages repository.\n\nThe incident was disclosed on July 20, 2026, and attributed to the OpenSSF's malicious packages tracking effort. The specific attack vector involved a compromised package being published to the NuGet registry.\n\nUsers of this package should immediately identify and remove affected versions from their environments and review any systems that may have executed code from this package.
Indicators of compromise
- Packages
- Tessa.Postgre.Sql
Remediation
- Remove all versions of Tessa.Postgre.Sql from affected projects
- Audit systems that may have installed or executed this package
- Replace with a legitimate PostgreSQL client library for .NET
- Review NuGet package sources and enable package verification where available
- Monitor for any suspicious activity on systems that may have been exposed to this package
Sources
- GitHub Advisory GHSA-3rw9-hwp5-pf4h · GitHub Advisory Database
Cite this entry
"Malicious code in Tessa.Postgre.Sql (NuGet)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed July 20, 2026; last updated July 20, 2026. https://supplychainattack.org/incident/malicious-code-in-tessa-postgre-sql-nuget-11n61r
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