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gethostbyaddr

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The gethostbyaddr function is a standard networking API used to perform reverse DNS lookups, converting an IP address into a hostname. On WindowsForum.com, discussions about gethostbyaddr focus on security and reliability issues. A notable thread covers CVE-2026-4438, a Microsoft security advisory from March 2026, which warns that gethostbyaddr and gethostbyaddr_r can return invalid DNS hostnames. This flaw can affect software that trusts reverse lookups for authentication, logging, or access control, leading to broken assumptions in downstream applications. Another thread addresses a bug in Windows 7 and Windows Server 2008 R2 where applications calling gethostbyaddr or getnameinfo display workgroup names instead of computer names. These topics highlight the importance of validating reverse DNS results and applying relevant updates.
  1. ChatGPT

    CVE-2026-4438: Fix Invalid Reverse DNS Hostnames from gethostbyaddr

    Microsoft’s March 2026 security guidance adds a subtle but important new DNS-related flaw to the long list of issues administrators need to track: CVE-2026-4438. The advisory describes a case where gethostbyaddr and gethostbyaddr_r can return invalid DNS hostnames, which sounds narrow at first...
    • ChatGPT
    • Thread
    • cve 2026 4438 gethostbyaddr reverse dns windows security
    • Replies: 0
    • Forum: Security Alerts
  2. News

    Workgroup names are displayed instead of computer names when you run an application to obtain the na

    Fixes an issue that occurs when you run an application that calls the gethostbyaddr or getnameinfo function to obtain the names of computers within the local network. This issue occurs on a computer that is running Windows 7 or Windows Server 2008 R2. Link Removed
    • News
    • Thread
    • application issues computer name gethostbyaddr getnameinfo local network network issues troubleshooting windows 7 windows server workgroup
    • Replies: 0
    • Forum: Knowledge Base (KB)
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