CVE-2026-35358

The cp utility in uutils coreutils, when performing recursive copies (-R), incorrectly treats character and block device nodes as stream sources rather than preserving them. Because the implementation reads bytes into regular files at the destination instead of using mknod, device semantics are destroyed (e.g., /dev/null becomes a regular file). This behavior can lead to runtime denial of service through disk exhaustion or process hangs when reading from unbounded device nodes.

• CWE-706

• https://github.com/uutils/coreutils/issues/9746Exploit, Issue Tracking
• https://github.com/uutils/coreutils/pull/11163Issue Tracking, Patch
• https://github.com/uutils/coreutils/releases/tag/0.7.0Release Notes
• https://github.com/uutils/coreutils/issues/9746Exploit, Issue Tracking

Published

Apr 22, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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