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CVE-2026-24061: GNU InetUtils Argument Injection Vulnerability

criticalknown exploitedpublic exploitCVE-2026-24061
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
GNU InetUtils contains an argument injection vulnerability in telnetd that could allow for remote authentication bypass via a "-f root" value for the USER environment variable.

CSIRTS triage

vendor: GNUproduct: InetUtilsAuthentication bypass
What
An argument injection vulnerability in telnetd could allow remote authentication bypass.
Who is affected
Deployments of GNU InetUtils are affected.
Urgency
Remediation is urgent as the vulnerability is actively exploited and critical in severity.
Action
Update to the latest version of GNU InetUtils.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-01-26
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-24061

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-24061coverage & exploitation statusNVD · CVE.org

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