CVE-2026-54638

td has pre-auth denial of service via unbounded memory allocation in proto.UnencryptedMessage.Decode

State: Published
Severity: 7.5 High
Published: Jul 28, 2026
Updated: Jul 29, 2026
Reserved: Jun 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling
CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
tdgotd	< 0.145.1Affected

References

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