CVE-2026-105841: lrzsz before 0.13.0 OS Command Injection via lrz Pipe Mode
Noroxi assessment
Priority: Monitor (action score 30/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.93% (FIRST EPSS); higher than 61.2% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No special conditions are required; it is repeatable.
- Fixed version: lrzsz (AlmaLinux:10) 0.12.20-69.el10_2; lrzsz (AlmaLinux:8) 0.12.20-46.el8_10; lrzsz (AlmaLinux:9) 0.12.20-58.el9_8.
Low priority for now. Upgrade to lrzsz (AlmaLinux:10) 0.12.20-69.el10_2; lrzsz (AlmaLinux:8) 0.12.20-46.el8_10; lrzsz (AlmaLinux:9) 0.12.20-58.el9_8 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Oct 6, 2026
- Updated
- Oct 6, 2026
- EPSS
- 0.9% · 61th percentile
- CWE
- CWE-78
Report tools
Action score
30
Low priority for now.
- CVSS
- 30 / 40 · 7.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.9%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · VulnCheck
- 7.7
- NVD has not scored this yet; the score shown is the CNA’s.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (VulnCheck). Independent of NVD's CPE analysis and usually ahead of it.
Uwe Ohse lrzsz
- before 0.13.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | lrzsz | before 0.12.20-69.el10_2 | 0.12.20-69.el10_2 |
| AlmaLinux:8 | lrzsz | before 0.12.20-46.el8_10 | 0.12.20-46.el8_10 |
| AlmaLinux:9 | lrzsz | before 0.12.20-58.el9_8 | 0.12.20-58.el9_8 |
| Debian:12 | lrzsz | from 0 | — |
| Debian:14 | lrzsz | before 0.13.1-1 | 0.13.1-1 |
| Red Hat:enterprise_linux:8::baseos | lrzsz | before 0:0.12.20-46.el8_10 | 0:0.12.20-46.el8_10 |
| Red Hat:enterprise_linux:8::baseos | lrzsz-debuginfo | before 0:0.12.20-46.el8_10 | 0:0.12.20-46.el8_10 |
| Red Hat:enterprise_linux:8::baseos | lrzsz-debugsource | before 0:0.12.20-46.el8_10 | 0:0.12.20-46.el8_10 |
| Rocky Linux:10 | lrzsz | before 0:0.12.20-69.el10_2 | 0:0.12.20-69.el10_2 |
| Rocky Linux:8 | lrzsz | before 0:0.12.20-46.el8_10 | 0:0.12.20-46.el8_10 |
| Rocky Linux:9 | lrzsz | before 0:0.12.20-58.el9_8 | 0:0.12.20-58.el9_8 |
Same product
uwe ohse: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-105840lrzsz before 0.13.0 Path Traversal via lrz Restricted Mode checkpath()30Monitor
- CVE-2026-105842lrzsz before 0.13.0 Heap Buffer Overflow via lrz procheader() Pathname24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:lrzsz | 0.12.20-46.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:lrzsz | 0.13.1-1 · Debian:14 | Package registry (OSV) |
| red hat:lrzsz | 0:0.12.20-46.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:lrzsz-debuginfo | 0:0.12.20-46.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:lrzsz-debugsource | 0:0.12.20-46.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| rocky linux:lrzsz | 0:0.12.20-46.el8_10 · Rocky Linux:8 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- Fix recorded+10 d
- TodayNov 13, 2026+38 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Tristan Madanifinder
Not on record for this CVE: patch commit or PR link · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- P
- Scope
- X
Weakness class (CWE)
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/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
nvd-secondary
Root cause
User input is inserted as text into a shell command. The shell may interpret special characters in the input as part of the command.
The bug in code
The whole CWE-78 classA representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.
Vulnerable
const host = req.body.host;
exec("ping -c 1 " + host, onResult);Fixed
const host = req.body.host;
if (!/^[a-z0-9.-]{1,253}$/i.test(host)) return res.sendStatus(400);
execFile("ping", ["-c", "1", host], onResult);Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Command DelimitersCAPEC-15likelihood: High · High
- Exploiting Multiple Input Interpretation LayersCAPEC-43likelihood: Medium · High
- Argument InjectionCAPEC-6likelihood: High · High
- OS Command InjectionCAPEC-88likelihood: High · High
ATT&CK techniques
—
Change log (2)
- Fix✗ → ✓
- Exploit maturity— → none
For records you follow, these changes also arrive as notifications. →
References
Show all references (2 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.