Bug 2519686 (CVE-2026-47187)

Summary:	CVE-2026-47187 sshfs: SSHFS Symlink Escape: Rogue SFTP Server → Local File Read/Write
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	unspecified	CC:	rhel-process-autobot, sdawley, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in SSHFS. A malicious SFTP (Secure File Transfer Protocol) server can supply crafted symbolic links containing absolute paths or parent directory traversal sequences that are resolved by the client system. When a local user or automated tool accesses or copies files through the mounted directory, these links can escape the mount point, enabling the server to read or overwrite arbitrary local client files. This vulnerability can lead to sensitive information disclosure or arbitrary code execution if critical files are overwritten.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2542529, 2542528
Bug Blocks:

Description OSIDB Bzimport 2026-08-19 15:03:19 UTC

SSHFS is a network filesystem client for connecting to SSH servers. Prior to version 3.7.6, a rogue SFTP server can return absolute symlink targets or relative targets containing parent-directory components that SSHFS passes through FUSE for resolution by the client kernel against the local filesystem. The documented transform_symlinks mitigation does not contain relative targets because transform_symlink() returns early at sshfs.c:2181, while sshfs_readlink() at sshfs.c:2234 to sshfs.c:2236 otherwise copies the server-supplied link target to the kernel. A victim or victim-side tool that follows such a link through ordinary operations such as cp, rsync, backup tooling, or an editor can disclose readable local files back to the server or write server-controlled content to writable local files, potentially including startup or scheduled-task files. This issue is fixed in version 3.7.6.