CVE-2026-62848High· 7.3▾ TwilightMetalama is a Roslyn-based open-source patterns and architecture toolkit for C#. From 2023.0.101-rc until 2025.1.18, 2026.0.25 and 2026.1.19, the Windows Visual Studio integration deserializes local named-pipe messages without restrictin…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 40.2 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Nov 3.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
Metalama is a Roslyn-based open-source patterns and architecture toolkit for C#. From 2023.0.101-rc until 2025.1.18, 2026.0.25 and 2026.1.19, the Windows Visual Studio integration deserializes local named-pipe messages without restricting which CLR types can be instantiated. The pipe connects devenv, the out-of-process Roslyn code-analysis process and the CodeLens process, and has the predictable name Metalama_{role}_{processId}_{hash(PackageVersion)}. Releases from the first public 2023.0 line through 2026.0.x use Newtonsoft.Json with TypeNameHandling.All; the later SerializationBinder only remaps assembly names, and BindToType resolves arbitrary wire-supplied types without an allow-list. Releases 2026.1.0 through 2026.1.18 use typeless MessagePack with TypelessObjectResolver and likewise instantiate arbitrary types. A same-user local process able to write to the pipe can send crafted messages that lead to arbitrary code execution with confidentiality, integrity and availability impacts inside the affected Visual Studio process. Default Windows pipe ACLs limit writers to the same logged-in user, so this does not escalate privileges or cross a security boundary; command-line and MSBuild-only builds do not use the channel. The maintained Metalama + PostSharp extension is affected from 2024.1 through 2026.1.4, while earlier Metalama-free PostSharp versions are unaffected. The retired Metalama and Caravela extensions remain affected and require removal or migration. The framework issue is fixed in versions 2025.1.18, 2026.0.25 and 2026.1.19; the maintained Metalama + PostSharp Visual Studio extension is fixed in version 2026.1.5. The retired Metalama and Caravela extensions require removal or migration.
Metalama >= 2023.0.101-rc, < 2025.1.18Metalama >= 2025.2.0-preview, <= 2025.2.5-rcMetalama >= 2026.0.0-preview, < 2026.0.25Metalama >= 2026.1.0-preview, < 2026.1.19Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
Metalama.Framework >= 2026.1.0-preview, < 2026.1.19Metalama.Framework < 2025.1.18Metalama.Framework >= 2026.0.1-preview, < 2026.0.25Patched in:
Metalama.Framework 2026.1.19Metalama.Framework 2025.1.18Metalama.Framework 2026.0.25Connected by shared product, vendor, weakness, or advisory.
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