The MITRE CVE dictionary describes this issue as:
Sendmail before 8.13.7 allows remote attackers to cause a denial of service via deeply nested, malformed multipart MIME messages that exhaust the stack during the recursive mime8to7 function for performing 8-bit to 7-bit conversion, which prevents Sendmail from delivering queued messages and might lead to disk consumption by core dump files.
Red Hat security errata
|Red Hat Enterprise Linux version 2.1 (sendmail)||RHSA-2006:0515||June 14, 2006|
|Red Hat Enterprise Linux version 3 (sendmail)||RHSA-2006:0515||June 14, 2006|
|Red Hat Enterprise Linux version 4 (sendmail)||RHSA-2006:0515||June 14, 2006|
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