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NVD Vulnerability Details :
CVE-2026-4438
Analyzed
More InfoOfficial Page
Source-3ff69d7a-14f2-4f67-a097-88dee7810d18
View Known Exploited Vulnerability (KEV) details
Published At-20 Mar, 2026 | 20:16
Updated At-07 Apr, 2026 | 18:40

Calling gethostbyaddr or gethostbyaddr_r with a configured nsswitch.conf that specifies the library's DNS backend in the GNU C library version 2.34 to version 2.43 could result in an invalid DNS hostname being returned to the caller in violation of the DNS specification.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary3.15.4MEDIUM
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Type: Secondary
Version: 3.1
Base score: 5.4
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CPE Matches
GNU
gnu
>>glibc>>Versions from 2.34(inclusive) to 2.43(inclusive)
cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-20Secondary3ff69d7a-14f2-4f67-a097-88dee7810d18
CWE-88Secondary134c704f-9b21-4f2e-91b3-4a467353bcc0
CWE ID: CWE-20
Type: Secondary
Source: 3ff69d7a-14f2-4f67-a097-88dee7810d18
CWE ID: CWE-88
Type: Secondary
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://sourceware.org/bugzilla/show_bug.cgi?id=340153ff69d7a-14f2-4f67-a097-88dee7810d18
Exploit
Issue Tracking
Patch
Hyperlink: https://sourceware.org/bugzilla/show_bug.cgi?id=34015
Source: 3ff69d7a-14f2-4f67-a097-88dee7810d18
Resource:
Exploit
Issue Tracking
Patch
Change History
0Changes found
Details not found