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Vulnerability record · CVE-2018-19591 · published 4 December 2018

CVE-2018-19591: Gnu glibc improper input validation vulnerability

Gnu · Glibc

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

7.5 CVSS 3.1 High EPSS 5.5% · top 7.5% CWE-20 · Improper input validationCWE-404 · Improper resource shutdown
7.5CVSS 3.1 base score, v2 5.0
5.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
22References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/106037 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1042174 Third Party AdvisoryVDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO7WHN52GFMC5F2I2232GFI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52KE4YR3GNMHQUOS3DKAGZ
https://security.gentoo.org/glsa/201903-09 Third Party Advisory
https://security.gentoo.org/glsa/201908-06
https://security.netapp.com/advisory/ntap-20190321-0003/
https://sourceware.org/bugzilla/show_bug.cgi?id=23927 ExploitIssue TrackingThird Party Advisory
https://sourceware.org/git/?p=glibc.git%3Ba=blob_plain%3Bf=NEWS%3Bhb=HEAD
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commitdiff%3Bh=d527c860f5a3f0ed687bd03f0cb464612dc23408
https://usn.ubuntu.com/4416-1/
http://www.securityfocus.com/bid/106037 Third Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1042174 Third Party AdvisoryVDB Entry
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO7WHN52GFMC5F2I2232GFI
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52KE4YR3GNMHQUOS3DKAGZ
https://security.gentoo.org/glsa/201903-09 Third Party Advisory
https://security.gentoo.org/glsa/201908-06
https://security.netapp.com/advisory/ntap-20190321-0003/
https://sourceware.org/bugzilla/show_bug.cgi?id=23927 ExploitIssue TrackingThird Party Advisory
https://sourceware.org/git/?p=glibc.git%3Ba=blob_plain%3Bf=NEWS%3Bhb=HEAD
https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commitdiff%3Bh=d527c860f5a3f0ed687bd03f0cb464612dc23408
https://usn.ubuntu.com/4416-1/

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2018-19591), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.