CVE-2026-39817
Description
A flaw was found in the "go tool pack" subcommand, a component of the Go programming language tools. This vulnerability allows an attacker to craft a malicious archive file. When this archive is extracted using the "pack" subcommand, it can lead to arbitrary file writes on the filesystem, potentially allowing an attacker to create or modify files in unintended locations.
Statement
This vulnerability is evaluated as having Moderate severity because the pack tool in the Go toolchain is an internal utility primarily invoked by the compiler during standard builds rather than as a general-purpose archive unpacker. Exploiting this issue requires local user interaction, specifically convincing a user or build pipeline to unpack an untrusted archive directly with this helper. While successful exploitation can result in unauthorized file modification on the host, the tool is not exposed as a network service or routinely used for unpacking external archives in Red Hat environments.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.9 | 5.9 | 5.9 |
| Attack Vector | Local | Local | Local |
| Attack Complexity | Low | Low | Low |
| Privileges Required | Low | Low | Low |
| User Interaction | Required | Required | Required |
| Scope | Changed | Changed | Changed |
| Confidentiality | None | None | None |
| Integrity Impact | High | High | High |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
NVD: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
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