Bug 2566282 (CVE-2026-88968)

Summary:	CVE-2026-88968 claude-code: claude-code: Sandbox escape via symlink replacement
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	sdawley
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Claude Code. An attacker capable of executing code within the tool's sandbox can overwrite arbitrary files outside the designated workspace, leading to a sandbox escape. This issue occurs because the Edit tool verifies file paths without securing them against changes to the underlying directory structure. By replacing a verified directory with a symbolic link (a reference pointing to another file path), the attacker can redirect file modification operations to sensitive locations on the host system.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-11-03 20:22:49 UTC

Claude Code is an agentic coding tool. Prior to 2.1.251, the Edit tool validates a target using pathname and symlink resolution that is not bound to the underlying directory inode or file descriptor. On macOS, attacker-controlled code running in the Bash sandbox can atomically replace an in-workspace parent directory with a symlink after validation, causing the unsandboxed Edit implementation to overwrite a user-writable file outside the workspace. Exploitation requires attacker-controlled code to run inside the sandbox, such as from a malicious repository or dependency script. This issue is fixed in version 2.1.251.