CVE-2026-35372 PUBLISHED

uutils coreutils ln Security Bypass via Improper Handling of the --no-dereference Flag

Assigner: canonical
Reserved: 02.04.2026 Published: 22.04.2026 Updated: 22.04.2026

A logic error in the ln utility of uutils coreutils allows the utility to dereference a symbolic link target even when the --no-dereference (or -n) flag is explicitly provided. The implementation previously only honored the "no-dereference" intent if the --force (overwrite) mode was also enabled. This flaw causes ln to follow a symbolic link that points to a directory and create new links inside that target directory instead of treating the symbolic link itself as the destination. In environments where a privileged user or system script uses ln -n to update a symlink, a local attacker could manipulate existing symbolic links to redirect file creation into sensitive directories, potentially leading to unauthorized file creation or system misconfiguration.

Metrics

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
CVSS Score: 5

Product Status

Vendor Uutils
Product coreutils
Versions Default: unaffected
  • affected from 0 to 0.8.0 (excl.)

Credits

  • Zellic finder

References

Problem Types

  • CWE-61: UNIX Symbolic Link (Symlink) Following CWE

Impacts

  • CAPEC-132: Symlink Attack