SB2026012255 - Multiple vulnerabilities in Inetutils - GNU network utilities

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Main Vulnerability Database SB2026012255

SB2026012255 - Multiple vulnerabilities in Inetutils - GNU network utilities

Published: January 22, 2026 Updated: August 31, 2026

Security Bulletin ID SB2026012255
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 3
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 33% High 33% Medium 33%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 3 vulnerabilities.


1) Improper Neutralization of Argument Delimiters in a Command (CVE-ID: CVE-2026-24061) Exploited

CWE-ID: CWE-88 - Argument Injection or Modification

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to compromise the affected system.

The vulnerability exists due to improper input validation when processing attacker-controlled USER environment variable. A remote non-authenticated attacker can simply connect to the remote server with a specially crafted environment variable and obtain root privileges. 

Exploitation example:

USER='-f root' telnet -a <host>



2) Stack-based buffer overflow (CVE-ID: CVE-2026-32746)

CWE-ID: CWE-121 - Stack-based buffer overflow

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to a stack-based buffer overflow in telnetd when processing an SLC suboption with many triplets using function octets greater than 18. A remote attacker can send a specially crafted telnet request to execute arbitrary code.


3) Improper privilege management (CVE-ID: CVE-2026-28372)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to improper handling of environment variables in telnetd when processing environment options with util-linux login systemd service credentials support. A remote attacker can pass crafted environment variables to escalate privileges.

Exploitation depends on util-linux login(1) support for systemd service credentials.


Remediation

Install update from vendor's website.

References