The MITRE CVE dictionary describes this issue as:
Heap-based buffer overflow in Mozilla Thunderbird before 126.96.36.199 and SeaMonkey before 1.0.3 allows remote attackers to cause a denial of service (crash) via a VCard attachment with a malformed base64 field, which copies more data than expected due to an integer underflow.
Red Hat security errata
|Red Hat Enterprise Linux version 2.1 (seamonkey)||RHSA-2006:0594||August 28, 2006|
|Red Hat Enterprise Linux version 3 (seamonkey)||RHSA-2006:0608||July 27, 2006|
|Red Hat Enterprise Linux version 4||RHSA-2006:0609||August 02, 2006|
|Red Hat Enterprise Linux version 4 (thunderbird)||RHSA-2006:0611||July 29, 2006|
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For clarification or corrections please contact the Red Hat Security Response Team.