High · CVSS 8.9CVE-2026-105429

NetBird client SSH config Match line injection via peer FQDN or hostname allows local command executionCVE-2026-105429

Answer in brief

CVE-2026-105429 records a High severity (CVSS 8.9) vulnerability in NetBird client SSH config Match line injection via peer FQDN or hostname allows local command execution. The current sources do not mark it as known exploited. The current feed maps NetBird/github.com/netbirdio/netbird (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 14, 2026Updated Oct 14, 2026Source checked Oct 14, 2026First seen by HOL Oct 14, 2026Material review Oct 14, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps NetBird/github.com/netbirdio/netbird (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
NetBird/github.com/netbirdio/netbirdgeneric	>=0.60.0 <0.74.7	0.74.7

Recommended response

Check inventory. Check lockfiles and deployed manifests for NetBird/github.com/netbirdio/netbird.
Review the reported fix. Source-reported solution: Upgrade the NetBird client to version 0.74.7 or later. In this version, buildHostPatterns accepts a peer FQDN or hostname only if it is a plain DNS name, and rejects quotes, whitespace, newlines, commas and SSH pattern metacharacters (pull request #6805).

Evidence timeline and material changes

Published upstream
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 14, 2026

Sources and claim methodology

Upstream source description

Improper neutralization of special elements in the NetBird client SSH configuration manager (client/ssh/config/manager.go) in NetBird versions 0.60.0 through 0.74.6 allows a malicious or compromised peer to execute arbitrary commands on other NetBird client hosts. The client writes a system-wide OpenSSH drop-in file (/etc/ssh/ssh_config.d/99-netbird.conf, or the equivalent under %PROGRAMDATA%\ssh\ssh_config.d on Windows) that embeds each peer FQDN or hostname inside a double-quoted Match host directive without escaping. A peer name containing a double quote breaks out of the quoted context and injects arbitrary SSH configuration directives, including exec commands, which run locally as any user on the host the next time that user runs ssh. Desktop clients on Linux, macOS, Windows and FreeBSD are affected; the Android and iOS apps are not. The issue is fixed in version 0.74.7, which accepts a peer FQDN or hostname only if it is a valid DNS name.

Quoted source text, attributed separately from HOL analysis.