CVE-2002-0906: Buffer overflow in Sendmail before 8.12.5, when configured to use a custom DNS map to query TXT records, al...

Security readout for executives and security teams

This is an old Sendmail flaw affecting versions before 8.12.5 only when a custom DNS map queries TXT records. A malicious DNS server could trigger a buffer overflow, causing mail service disruption and possibly code execution. Exposure is configuration-specific, but affected mail infrastructure should be retired or upgraded. Likely limited to legacy Sendmail deployments before 8.12.5 using custom DNS maps for TXT lookups. Standard installations without that configuration are not clearly affected by the provided sources. Treat as high priority only for legacy Sendmail environments. If no pre-8.12.5 Sendmail or custom DNS TXT map usage exists, business urgency is low after documentation. Mitigation focus: Identify any Sendmail installations older than 8.12.5.; Check whether custom DNS maps query TXT records.; Upgrade affected Sendmail deployments to 8.12.5 or later per vendor guidance..

Prepared

Jun 30, 2026, 12:09 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.