CVE-2026-54638Public exploitNetwork attack vector

Pre-auth service interruption via oversized payload allocation

Published Jul 28, 2026 · Updated Jul 28, 2026

Memory exhaustion in gotd td before 0.145.1 allows remote attackers to interrupt service via a crafted unencrypted MTProto packet. The proto.UnencryptedMessage.Decode method trusts the packet's 32-bit dataLen and allocates that amount before checking the remaining buffer. The unauthenticated handshake path reaches the decoder before credentials or a session exist; impact is limited to memory and CPU pressure or process termination.

CVSS severity7.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in gotd td before 0.145.1 allows remote attackers to interrupt service via a crafted unencrypted MTProto packet. The proto.UnencryptedMessage.Decode method trusts the packet's 32-bit dataLen and allocates that amount before checking the remaining buffer. The unauthenticated handshake path reaches the decoder before credentials or a session exist; impact is limited to memory and CPU pressure or process termination.

The record

CVE
CVE-2026-54638
Published
Jul 28, 2026
Updated
Jul 28, 2026
Vendor
gotd
Product
td
Classifications
CWE-770, CWE-789, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.145.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

gotd · tdversion=< 0.145.1

Published CVSS scores

7.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-789Memory Allocation with Excessive Size Value
T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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