Bug 2523574 (CVE-2026-79783)

Summary: CVE-2026-79783 github.com/rclone/rclone: rclone: Privilege Escalation via setuid/setgid metadata
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: aazores, cmah, eaguilar, ebaron, gparvin, jmatsuok, jtolenti, pjindal, rhaigner
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in rclone. This vulnerability allows a remote attacker to escalate privileges by manipulating file metadata. When copying files with metadata preservation from an untrusted source, rclone fails to properly mask special permission bits. This oversight enables an attacker to set setuid or setgid bits on their controlled files, potentially leading to privilege escalation to root or the service account user if rclone is running with elevated permissions.
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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 2026-08-25 15:35:13 UTC 
rclone before 1.74.4 fails to mask special permission bits when applying source-supplied mode metadata in the local backend, allowing attackers to set setuid/setgid bits on attacker-controlled files. When copying with metadata preservation from an untrusted remote, attackers can plant a setuid binary that escalates privileges to root if rclone runs as root, or to the service account user otherwise.