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Fencer Intel
medium 6.4

CVE-2026-105842 json

lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname

published last mo. modified last mo. also EUVD-2026-93394

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

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.

Patch / fix

  • Uwe Ohse lrzsz 0.13.0
  • lrzsz Debian 14 0.12.21rc-5

debian advisories DEBIAN-CVE-2026-105842

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-105842 updated cvss 6.4

lrzsz: lrzsz: Denial of Service via heap-based buffer overflow from oversized filenames

  • Red Hat Enterprise Linux 6 lrzsz 0.12.20-66.el10
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 lrzsz 0.12.20-66.el10 Red Hat Enterprise Linux 8 lrzsz, lrzsz 0.12.20-66.el10 Red Hat Enterprise Linux 9 lrzsz, lrzsz 0.12.20-66.el10 Red Hat Enterprise Linux 10 lrzsz 0.12.20-66.el10
    affected: workaround, no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 6.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
CNA 3.1 6.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:H
CNA 4.0 6.1 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • Uwe Ohse lrzsz

Classification

Weakness
  • CWE-122 Heap-based Buffer Overflow

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.