GCVE-110-OSM-2026-773

Advisory PublishedCVSS 9.6/10

Vulnetix · Advisory published March 27, 2026

Malicious Tessa document management analyzer library. Supply chain attack targeting enterprise document systems with MSBuild-based code execution. Exploits NuGet's MSBuild integration by placing malicious code in .targets files as inline tasks. When projects build, MSBuild automatically imports and executes these tasks, downloading .NET executables from throwaway GitHub repositories with embedded obfuscated command-line payloads.

Download JSON Open in Console

Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

9.6/10

Critical · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected Products

Vendor	Product	Versions	Platforms
unknown	Tessa.Analyzer	all (affected)	—

References

Malicious nuget package: Tessa.Analyzer

advisory

vendor

Browse GCVE Records

72,148 records in the GCVE database · Updated July 14, 2026

No matching records found.

Explore Further

Investigate this vulnerability in the interactive console or download the raw GCVE record.

Open in Console Download JSON