{"cve":"CVE-2023-4806","nvd":{"published":"2023-09-18T17:15:55.813","modified":"2026-07-14T14:16:31.910","status":"Modified","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","score":5.9},"cwes":["CWE-416"],"references":["https://access.redhat.com/errata/RHSA-2023:5453","https://access.redhat.com/errata/RHSA-2023:5455","https://access.redhat.com/errata/RHSA-2023:7409","https://access.redhat.com/security/cve/CVE-2023-4806","https://bugzilla.redhat.com/show_bug.cgi?id=2237782"],"products":["fedoraproject:fedora","gnu:glibc","redhat:codeready_linux_builder_eus","redhat:codeready_linux_builder_eus_for_power_little_endian","redhat:codeready_linux_builder_eus_for_power_little_endian_eus","redhat:codeready_linux_builder_for_arm64","redhat:codeready_linux_builder_for_arm64_eus","redhat:codeready_linux_builder_for_ibm_z_systems","redhat:codeready_linux_builder_for_ibm_z_systems_eus","redhat:enterprise_linux","redhat:enterprise_linux_eus","redhat:enterprise_linux_for_arm_64","redhat:enterprise_linux_for_arm_64_eus","redhat:enterprise_linux_for_ibm_z_systems","redhat:enterprise_linux_for_ibm_z_systems_eus","redhat:enterprise_linux_for_ibm_z_systems_eus_s390x","redhat:enterprise_linux_for_ibm_z_systems_s390x","redhat:enterprise_linux_for_power_little_endian","redhat:enterprise_linux_for_power_little_endian_eus","redhat:enterprise_linux_server_aus","redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions","redhat:enterprise_linux_tus"],"source":"nvd","synced_at":"2026-10-19T21:39:24.235896374+00:00"},"epss":{"cve":"CVE-2023-4806","score":0.01606,"percentile":0.75886,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}