Read the docs
TI-2026-68424 Aliases CVE-2026-105841GHSA-w9c3-4vq7-c452

OS command injection in lrzsz lrz pipe mode

Priority LOW 37CWE-78Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
Low
Attack requirements
Present
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 3 fixed, 1 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-78.

Summary

lrzsz before 0.13.0 contains an OS command injection flaw in the pipe mode of the lrz receive utility (CWE-78). When lrz runs under a suffixed name such as lrztar, the unescaped filename sent by the remote peer is passed to popen(), so shell metacharacters in a crafted filename run as the receiving user. An unauthenticated remote sender can execute commands on the receiving system if a user runs lrz in this mode.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

lrzsz before 0.13.0 contains an OS command injection vulnerability in the lrz receive utility's pipe mode that allows remote senders to execute commands by supplying crafted filenames. When lrz runs under a suffixed name such as lrztar, procheader() in src/lrz.c passes the unescaped ZMODEM/YMODEM filename to popen(), so shell metacharacters execute as the receiving user.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00935 61st percentileScored 2026-11-07
Fix Partial lrzsz (Uwe Ohse): 0.13.0Red Hat: 3 advisoriesRed Hat: 3 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

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

Update lrzsz to version 0.13.0. Red Hat fixed Red Hat Enterprise Linux BaseOS 8 in RHSA-2026:83525, BaseOS 9 in RHSA-2026:89755, and BaseOS 10 in RHSA-2026:86056. The sources list no fixed version for Red Hat Enterprise Linux 7.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

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

Red Hat 3 advisories

  • RHSA-2026:89755 Released 2026-10-26 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 9) lrzsz-0.12.20-58.el9_8
  • RHSA-2026:86056 Released 2026-10-20 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 10) lrzsz-0.12.20-69.el10_2
  • RHSA-2026:83525 Released 2026-10-15 · Red Hat rating Important
    lrzsz security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) lrzsz-0.12.20-46.el8_10

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-2026-68423 Path traversal in lrzsz lrz restricted mode lets senders overwrite filesPriority LOW 35
    • TI-2026-68425 Heap buffer overflow in lrzsz lrz when receiving long filenamesPriority LOW 27
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:86056
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:83525
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:89755
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-06 Threatist record created from CVE-2026-105841
  2. 2026-10-06 Alias added: GHSA-w9c3-4vq7-c452
  3. 2026-10-07 Affected versions changed · Red Hat
  4. 2026-10-07 CVSS score added · Red Hat
  5. 2026-10-16 Fix available: RHSA-2026:83525 · Red Hat
  6. 2026-10-16 Fix available: Red Hat Enterprise Linux BaseOS (v. 8) · Red Hat
  7. 2026-10-21 Fix available: RHSA-2026:86056 · Red Hat
  8. 2026-10-21 Fix available: Red Hat Enterprise Linux BaseOS (v. 10) · Red Hat
  9. 2026-10-26 Fix available: RHSA-2026:89755 · Red Hat
  10. 2026-10-26 Fix available: Red Hat Enterprise Linux BaseOS (v. 9) · Red Hat

References

Advisory 1

Other 1

  • TI-2026-68423 Path traversal in lrzsz lrz restricted mode lets senders overwrite files CVSS 4.0HIGH 7.7
  • TI-2026-68425 Heap buffer overflow in lrzsz lrz when receiving long filenames CVSS 4.0MEDIUM 6.1

Sources

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