CVE-2026-39399 — AI Deep Analysis Summary

🚨 **Essence**: NuGet Gallery suffers from a **Path Traversal** vulnerability due to insufficient input validation on `.nuspec` files.…

🛡️ **Root Cause**: The core issue is **CWE-20 (Improper Input Validation)**. Specifically, the system fails to properly sanitize or validate file paths within `.nuspec` metadata.…

🏢 **Affected Entities**: The vulnerability impacts **NuGet Gallery**, the open-source software package repository maintained by **NuGet**.…

🕵️ **Attacker Capabilities**: With this vulnerability, hackers can perform **Cross-Package Metadata Injection**.…

🔐 **Exploitation Threshold**: **Medium**. The CVSS vector indicates **AV:N** (Network), **AC:L** (Low Complexity), **UI:N** (No User Interaction), but requires **PR:L** (Low Privileges).…

📦 **Public Exploit Status**: Currently, the **PoCs (Proof of Concepts) list is empty** in the provided data.…

🔍 **Self-Check Method**: Scan your NuGet Gallery instances for unpatched versions. Specifically, inspect the handling of **`.nuspec` file inputs**.…

✅ **Official Fix**: **Yes**. NuGet has released a fix. Refer to the security advisory **GHSA-9r3h-v4hx-rhfr** and the specific commit **0e80f87628349207cdcaf55358491f8a6f1ca276** for the patch details.…

🚧 **Workaround (If No Patch)**: If you cannot patch immediately, implement strict **input validation** on all `.nuspec` file uploads. Enforce allow-lists for file paths and metadata fields.…

🔥 **Urgency**: **HIGH**. With a CVSS score indicating High Integrity and Availability impact, and Low Attack Complexity, this vulnerability is critical. Prioritize patching to prevent **RCE** and **Data Corruption**.…