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TI-2026-39467 Aliases CVE-2026-54638GHSA-whmm-qj9r-wvr2

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

Priority MEDIUM 40CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

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([]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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0063 50th percentileScored 2026-11-07
Fix Fixed td (gotd): 0.145.1github.com/gotd/td (Go): 0.145.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
gotdtdbefore 0.145.10.145.1Patch availableCNA
—github.com/gotd/td (Go)before 0.145.10.145.1Patch availableGHSA-whmm-qj9r-wvr2
  • td Vendorgotd Affected before 0.145.1 Fixed in 0.145.1 Patch available CNA
  • github.com/gotd/td (Go) Vendor— Affected before 0.145.1 Fixed in 0.145.1 Patch available GHSA-whmm-qj9r-wvr2

Remediation

  • Fix · CNA td (gotd) Fixed in 0.145.1
  • Fix · GHSA-whmm-qj9r-wvr2 github.com/gotd/td (Go) Fixed in 0.145.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-54638
  2. 2026-10-03 Alias added: GHSA-whmm-qj9r-wvr2
  3. 2026-10-28 EPSS moved to the 50th–90th percentile

References

Other 5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences