CVE-2026-39861
CriticalSummary
Claude Code to narzędzie do kodowania, które przed wersją 2.1.64 nie zapobiegało tworzeniu symlinków przez procesy w piaskownicy, wskazujących na lokalizacje poza obszarem roboczym. To umożliwiało ucieczkę z piaskownicy, pozwalając na zapis do dowolnych lokalizacji, co mogło prowadzić do wykonania kodu poza piaskownicą.
Risk Assessment
Ryzyko dla organizacji polega na możliwości nieautoryzowanego dostępu do systemu plików i wykonania złośliwego kodu, co może prowadzić do poważnych naruszeń bezpieczeństwa.
Recommendation
Zaleca się aktualizację do wersji 2.1.64 lub nowszej, aby zniwelować tę podatność. Użytkownicy korzystający z ręcznych aktualizacji powinni jak najszybciej przeprowadzić aktualizację.
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Original NVD description (English source)
Claude Code is an agentic coding tool. Prior to version 2.1.64, 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 version 2.1.64 or later.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS