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TI-2026-68425 Aliases CVE-2026-105842GHSA-3cw3-cf87-8pwp

Heap buffer overflow in lrzsz lrz when receiving long filenames

Priority LOW 27CWE-122Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
Partial Red Hat: 5 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

lrzsz before 0.13.0 from Uwe Ohse contains a heap-based buffer overflow (CWE-122) in procheader() of the lrz receive utility. Overlong sender-supplied filenames are copied into Pathname, corrupting heap memory and crashing lrz. A malicious ZMODEM sender can supply filenames up to 8192 bytes to trigger it.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

lrzsz before 0.13.0 contains a heap-based buffer overflow vulnerability in procheader() of the lrz receive utility when copying overlong sender-supplied filenames into Pathname. Malicious ZMODEM senders can supply filenames up to 8192 bytes, overflowing the buffer via sprintf() in pipe mode or strcpy() to corrupt heap memory and crash lrz.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00206 10th percentileScored 2026-11-07
Fix Partial lrzsz (Uwe Ohse): 0.13.0Red Hat: 5 without a fix

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
Uwe Ohselrzszbefore 0.13.00.13.0Patch availableCNA
  • lrzsz VendorUwe Ohse Affected before 0.13.0 Fixed in 0.13.0 Patch available CNA

Remediation

Upgrade lrzsz to 0.13.0, which fixes the flaw. Red Hat lists Red Hat Enterprise Linux 6 as having no fix planned and Red Hat Enterprise Linux 7, 8, 9 and 10 as having no fix available.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA lrzsz (Uwe Ohse) Fixed in 0.13.0

Fixed in the same release

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

  • Advisory ·

    Uwe Ohse lrzsz — lrzsz 0.13.0 security changes

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-68424 OS command injection in lrzsz lrz pipe modePriority LOW 37
    • TI-2026-68423 Path traversal in lrzsz lrz restricted mode lets senders overwrite filesPriority LOW 35
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105842
  2. 2026-10-06 Alias added: GHSA-3cw3-cf87-8pwp
  3. 2026-10-06 CISA SSVC decision points changed
  4. 2026-10-06 Priority changed: MEDIUM → LOW
  5. 2026-10-07 Affected versions changed · Red Hat
  6. 2026-10-07 CVSS score added · Red Hat

References

Advisory 1

Other 1

  • TI-2026-68424 OS command injection in lrzsz lrz pipe mode CVSS 4.0HIGH 7.7
  • TI-2026-68423 Path traversal in lrzsz lrz restricted mode lets senders overwrite files CVSS 4.0HIGH 7.7

Sources

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