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Vulnerability record · CVE-2026-54638 · published 28 July 2026

CVE-2026-54638: Allocation without limits vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.63% · top 51.9% CWE-770 · Allocation without limitsCWE-789 · CWE-789 Deferred
7.5CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
10 Sep 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa
https://github.com/gotd/td/issues/1711
https://github.com/gotd/td/releases/tag/v0.145.1
https://github.com/gotd/td/security/advisories/GHSA-whmm-qj9r-wvr2

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Source: NIST National Vulnerability Database (record CVE-2026-54638), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.