GCVE-110-OSM-2026-4939

Advisory PublishedCVSS 8.8/10

Vulnetix · Advisory published May 5, 2026

Malicious NuGet package published by the same 'sicoob' / Sicoob-Cooperativa owner account behind the trojanized Sicoob.Sdk package. Part of a fake 'official SDK' ecosystem impersonating Brazilian financial cooperative Sicoob, used to add legitimacy and expand the supply-chain attack surface around stolen banking certificates and credentials. Published by malicious NuGet owner 'sicoob' (GitHub org Sicoob-Cooperativa) alongside the trojanized Sicoob.Sdk package that exfiltrates banking mTLS certificates and PFX passwords via Sentry DSN: https://d565e3f03d0b1a7c8935d7ff94237316@o4511335034847232.ingest.de.sentry.io/4511337546317904

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Weaknesses (CWE)

CWE-506Embedded Malicious Code

Risk Scores

CVSS 3.1

8.8/10

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

Affected Products

Vendor	Product	Versions	Platforms
unknown	Sicoob-Cooperativa.Sicoob.Pix	all (affected)	—

References

Malicious nuget package: Sicoob-Cooperativa.Sicoob.Pix

advisory

vendor

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