CVE-2003-1135: Yahoo Messenger

Low severity, CVSS 2.6. EPSS: 4.5% chance of exploitation in the next 30 days.

Buffer overflow in Yahoo! Messenger 5.6 allows remote attackers to cause a denial of service (crash) via a file send request (sendfile) with a large number of "%" (percent) characters after the Yahoo ID.

Affected products

• Yahoo Messenger: version 5.6 only

Published 2003-12-31. Last modified 2026-06-16.