---
id: CVE-2026-54638
title: gotd/td is a T Telegram MTProto API client in Go
summary: >-
  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([]…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
  - CWE-789
vendor: gotd
product: github.com/gotd/td
affected:
  - github.com/gotd/td < 0.145.1
patched:
  - github.com/gotd/td 0.145.1
published: '2026-07-28'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T20:05:05.293'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54638'
references:
  - url: 'https://github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa'
    label: security-advisories@github.com
  - url: 'https://github.com/gotd/td/issues/1711'
    label: security-advisories@github.com
  - url: 'https://github.com/gotd/td/releases/tag/v0.145.1'
    label: security-advisories@github.com
  - url: 'https://github.com/gotd/td/security/advisories/GHSA-whmm-qj9r-wvr2'
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-whmm-qj9r-wvr2'
tags:
  - nvd
  - ghsa
  - go
epss: 0.0063
epssPercentile: 0.47961
aliases:
  - GHSA-whmm-qj9r-wvr2
ecosystem: go
ingestedAt: '2026-07-28T22:40:03.235Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-54638)

Affected packages:

- `github.com/gotd/td < 0.145.1`

Patched in:

- `github.com/gotd/td 0.145.1`

Source: https://github.com/advisories/GHSA-whmm-qj9r-wvr2