Read the docs
TI-2026-27485 Aliases CVE-2026-35347GHSA-3wfc-mgpm-9rq6

uutils coreutils comm Silent Data Loss or Denial of Service via Improper Input Validation

Priority LOW 19CWE-20Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · Low · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

The comm utility in uutils coreutils incorrectly consumes data from non-regular file inputs before performing comparison operations. The are_files_identical function opens and reads from both input paths to compare content without first verifying if the paths refer to regular files. If an input path is a FIFO or a pipe, this pre-read operation drains the stream, leading to silent data loss before the actual comparison logic is executed. Additionally, the utility may hang indefinitely if it attempts to pre-read from infinite streams like /dev/zero.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00135 2nd percentileScored 2026-11-07
Fix Fixed coreutils (Uutils): 0.6.0uu_comm (crates.io): 0.6.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Uutilscoreutilsbefore 0.6.00.6.0Patch availableCNA
—uu_comm (crates.io)before 0.6.00.6.0Patch availableGHSA-3wfc-mgpm-9rq6
  • coreutils VendorUutils Affected before 0.6.0 Fixed in 0.6.0 Patch available CNA
  • uu_comm (crates.io) Vendor— Affected before 0.6.0 Fixed in 0.6.0 Patch available GHSA-3wfc-mgpm-9rq6

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:uutils:coreutils:*:*:*:*:*:rust:*:*before 0.6.0VulnerableUutils
  • cpe:2.3:a:uutils:coreutils:*:*:*:*:*:rust:*:* Versions before 0.6.0 Vulnerable ·Uutils

Remediation

  • Fix · CNA coreutils (Uutils) Fixed in 0.6.0
  • Fix · GHSA-3wfc-mgpm-9rq6 uu_comm (crates.io) Fixed in 0.6.0 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Uutils coreutils — github.com/uutils/coreutils/releases/tag/0.6.0

    12 records Highest priority Priority MEDIUM 3 MEDIUM, 9 LOW

    Other records, highest priority first

    • TI-2026-27493 uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU RacePriority MEDIUM 61
    • TI-2026-27504 uutils coreutils printenv Security Inspection Bypass via UTF-8 EnforcementPriority MEDIUM 54
    • TI-2026-27484 uutils coreutils comm Silent Data Corruption via Lossy UTF-8 NormalizationPriority MEDIUM 49
    Show all 12 records → Advisory →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-35347
  2. 2026-10-03 Alias added: GHSA-3wfc-mgpm-9rq6

References

Patch 1

Advisory 2

Other 3

  • TI-2026-27506 uutils coreutils chroot Local Privilege Escalation and chroot Escape in via Name Service Switch (NSS) Injection CVSS 3.1HIGH 7.2
  • TI-2026-27498 uutils coreutils touch Arbitrary File Truncation via TOCTOU Race Condition CVSS 3.1MEDIUM 6.3
  • TI-2026-27488 uutils coreutils cp Unexpected Privileged Executable Creation with -p CVSS 3.1MEDIUM 6.6
  • TI-2026-27502 uutils coreutils mv Arbitrary File Overwrite via Cross-Device TOCTOU Race Condition CVSS 3.1MEDIUM 6.3
  • TI-2026-27493 uutils coreutils install Arbitrary File Overwrite via Symlink TOCTOU Race CVSS 3.1MEDIUM 6.3
  • TI-2026-27511 uutils coreutils ln Local Denial of Service via Improper Handling of Non-UTF-8 Filenames CVSS 3.1MEDIUM 5.5
See all 43 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences