๐Ÿ›ก๏ธ CVE-2026-39399
๐Ÿ”ด CVSS 9.6 โ€” Critical โœ… No Known Exploit CWE-20 NVD
9.6
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

NuGet Gallery is a package repository that powers nuget.org. A security vulnerability exists in the NuGetGallery backend jobโ€™s handling of .nuspec files within NuGet packages. An attacker can supply a crafted nuspec file with malicious metadata, leading to cross package metadata injection that may result in remote code execution (RCE) and/or arbitrary blob writes due to insufficient input validation. The issue is exploitable via URI fragment injection using unsanitized package identifiers, allowing an attacker to control the resolved blob path. This enables writes to arbitrary blobs within the storage container, not limited to .nupkg files, resulting in potential tampering of existing content. This issue has been patched in commit 0e80f87628349207cdcaf55358491f8a6f1ca276.

Details

Severity CRITICAL
CVSS Score 9.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
CWE CWE-20
Public Exploit โœ… No
Source NVD
Published 2026-04-14
Updated 2026-06-02
Modified 2026-04-17
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown โ€” โ€”

Similar Threats

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