CVE-2026-3184

LOW

3.7

CVSS v3

Description

A flaw was found in util-linux. Improper hostname canonicalization in the `login(1)` utility, when invoked with the `-h` option, can modify the supplied remote hostname before setting `PAM_RHOST`. A remote attacker could exploit this by providing a specially crafted hostname, potentially bypassing host-based Pluggable Authentication Modules (PAM) access control rules that rely on fully qualified domain names. This could lead to unauthorized access.

CWE-289

How to fix

Remediation Available

util-linuxDebian

Fixed in:2.42-1CVE-2026-3184

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:U

Exploit Intelligence

0.44%probability of exploitation in 30 days

36thpercentile

Low risk: more likely to be exploited than 36% of all known CVEs.

References

Third-Party Advisory3

Related Vulnerabilities

Other CWE-289 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-56511	Critical	9.8	44%	-	Fix
CVE-2021-34746	Critical	9.8	18%	-	Fix
CVE-2017-16590	High	8.8	3.3%	-	-
CVE-2026-48618	Medium	6.5	3.2%	-	Fix
CVE-2025-55130	Critical	9.1	1.6%	-	Fix
CVE-2026-44492	High	8.6	0.9%	-	Fix

Common questions

How do I fix CVE-2026-3184?

Upgrade util-linux on debian unstable to 2.42-1 or later.

Is CVE-2026-3184 being actively exploited?

Not that we know of. CVE-2026-3184 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.44% is the estimated probability that it will be exploited in the next 30 days. That is higher than 36% of all scored CVEs.

How severe is CVE-2026-3184?

CVE-2026-3184 has a CVSS v3 base score of 3.7, rated low. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-3184 affect?

Published advisories record a fix for util-linux (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-21.