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Overview

X41 D-Sec GmbH is a renowned expert provider from Aachen (Germany) for dedicated high quality security research, source code audits, application security services, penetration tests, and full red teaming.

News

Blog 1 month ago
X41 Audited NLnet Labs Routinator
Security Audit of NLnet Labs Routinator X41 performed a source code audit of NLnet Labs Routinator , commissioned by the Sovereign Tech Agency . It is a Relying Party software for Resource Public Key Infrastructure (RPKI). At a functional level, Routinato
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Blog 3 months ago
Advisory X41-2026-002: Request Host Header not Validated in Starlette
X41 D-Sec GmbH Security Advisory: X41-2026-002 Request Host Header not Validated in Starlette Severity Rating: High Confirmed Affected Versions: starlette = 0.8.3, 1.0.1 Confirmed Patched Versions: starlette 1.0.1 Vendor: Starlette Vendor URL: https://git
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Blog 4 months ago
X41 Reviewed SecureDrop
Review of SecureDrop Workstation X41 performed a white-box penetration test against SecureDrop Workstation , which is used to connect to the SecureDrop whistleblower submission system. The system was originally coded by Aaron Swartz and is now managed by
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Blog 4 months ago
Advisory X41-2026-001: Guardrail Sandbox Escape in LiteLLM
X41 D-Sec GmbH Security Advisory: X41-2026-001 Guardrail Sandbox Escape in LiteLLM Severity Rating: High Confirmed Affected Versions: main-latest (docker image ghcr.io/berriai/litellm:main-latest , repo digest ghcr.io/berriai/litellm@sha256:bb063970179621
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Blog 4 months ago
Review of AzireVPN and Malwarebytes Privacy VPN
Review of AzireVPN and Malwarebytes Privacy VPN X41 performed a white box penetration test against the AzireVPN framework, which is used to power the Malwarebytes Privacy VPN service. The full report can be found here: https://www.x41-dsec.de/static/repor
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