CVE-2026-39861

描述

Claude Code's sandbox did not prevent sandboxed processes from creating symlinks pointing to locations outside the workspace. When Claude Code subsequently wrote to a path within such a symlink, its unsandboxed process followed the symlink and wrote to the target location outside the workspace without prompting the user for confirmation. This allowed a sandbox escape where neither the sandboxed command nor the unsandboxed app could independently write outside the workspace, but their combination could write to arbitrary locations, potentially leading to code execution outside the sandbox. Reliably exploiting this required the ability to add untrusted content into a Claude Code context window to trigger sandboxed code execution via prompt injection. Users on standard Claude Code auto-update have received this fix automatically. Users performing manual updates are advised to update to the latest version. Claude Code thanks hackerone.com/philts for reporting this issue.

如何修補 CVE-2026-39861

要修補 CVE-2026-39861,請將受影響套件升級到下列已修補版本。

• —升級至 2.1.64 或更新版本

CVE-2026-39861 正在被利用嗎?

低 — EPSS 為 0.5%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 2.1.64

CVSS 分數

參考連結(3)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-39861
• PATCHgithub.com/anthropics/claude-code
• WEBgithub.com/anthropics/claude-code/security/advisories/GHSA-vp62-r36r-9xqp