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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-54638
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-28 23:17:08 UTC
Updated2026-07-29 15:16:24 UTC
Descriptiongotd/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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.003460000 probability, percentile 0.272360000 (date 2026-07-30)

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gotd Td affected < 0.145.1 Not specified

References

ReferenceSourceLinkTags
github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa [email protected] github.com
github.com/gotd/td/security/advisories/GHSA-whmm-qj9r-wvr2 [email protected] github.com
github.com/gotd/td/issues/1711 [email protected] github.com
github.com/gotd/td/releases/tag/v0.145.1 [email protected] github.com
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