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Vulnerability record · CVE-2023-4806 · published 18 September 2023

CVE-2023-4806: Gnu glibc use after free vulnerability

Gnu · Glibc

A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.

5.9 CVSS 3.1 Medium EPSS 1.6% · top 25.1% CWE-416 · Use after free
5.9CVSS 3.1 base score
1.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
22Affected product versions listed by NVD
21References
14 Jul 2026Last modified by NVD

Description

A flaw has been identified in glibc. In an extremely rare situation, the getaddrinfo function may access memory that has been freed, resulting in an application crash. This issue is only exploitable when a NSS module implements only the _nss_*_gethostbyname2_r and _nss_*_getcanonname_r hooks without implementing the _nss_*_gethostbyname3_r hook. The resolved name should return a large number of IPv6 and IPv4, and the call to the getaddrinfo function should have the AF_INET6 address family with AI_CANONNAME, AI_ALL and AI_V4MAPPED as flags.

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

Affected products

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

References

LinkTags
https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:7409
https://access.redhat.com/security/cve/CVE-2023-4806 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2237782 Issue TrackingThird Party Advisory
http://www.openwall.com/lists/oss-security/2023/10/03/4
http://www.openwall.com/lists/oss-security/2023/10/03/5
http://www.openwall.com/lists/oss-security/2023/10/03/6
http://www.openwall.com/lists/oss-security/2023/10/03/8
https://access.redhat.com/errata/RHSA-2023:5453 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:5455 Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:7409
https://access.redhat.com/security/cve/CVE-2023-4806 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2237782 Issue TrackingThird Party Advisory
https://lists.fedoraproject.org/archives/list/[email protected]/message/4DBUQRRPB47TC3NJOUIBVWUGF
https://lists.fedoraproject.org/archives/list/[email protected]/message/DFG4P76UHHZEWQ26FWBXG76N2
https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAQWHTSVOCOZ5K6KPIWKRT3J
https://security.gentoo.org/glsa/202310-03
https://security.netapp.com/advisory/ntap-20240125-0008/
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
https://cert-portal.siemens.com/productcert/html/ssa-831302.html

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Source: NIST National Vulnerability Database (record CVE-2023-4806), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.