CVE-2026-54638: Gotd Td

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

gotd/td is a T Telegram MTProto API client in Go. Prior to 0.145.1, proto.UnencryptedMessage.Decode in proto/unencrypted_message.go read attacker controlled dataLen from an unauthenticated MTProto unencrypted packet and allocated make([]byte, dataLen) before checking the remaining buffer, allowing remote unauthenticated denial of service through excessive memory allocation and CPU or garbage collection pressure. This issue is fixed in version 0.145.1.

Affected products

• Gotd Td: before 0.145.1 (fixed in 0.145.1)

Published 2026-07-28. Last modified 2026-09-10.