CVE-2026-35345

Summary

A vulnerability in the tail utility of uutils coreutils allows for the exfiltration of sensitive file contents when using the –follow=name option. Unlike GNU tail, the uutils implementation continues to monitor a path after it has been replaced by a symbolic link, subsequently outputting the contents of the link's target. In environments where a privileged user (e.g., root) monitors a log directory, a local attacker with write access to that directory can replace a log file with a symlink to a sensitive system file (such as /etc/shadow), causing tail to disclose the contents of the sensitive file.

Affected Software

VendorProductVersion RangeStatus

Weaknesses

  • CWE-367: CWE-367: Time-of-Check Time-of-Use (TOCTOU) Race Condition
  • CWE-59: CWE-59: Improper Link Resolution Before File Access ('Link Following')

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References