{"id":"CVE-2026-54638","aliases":["GHSA-whmm-qj9r-wvr2","GO-2026-6138"],"url":"https://o3.security/vulnerability/CVE-2026-54638","summary":"td has pre-auth denial of service via unbounded memory allocation in proto.UnencryptedMessage.Decode","details":"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.","published":"2026-07-28T22:14:53.550Z","modified":"2026-09-12T03:30:31.510790438Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00346,"percentile":0.27135,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/gotd/td","fixedVersion":"0.145.1"}],"fix":{"url":"https://github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa","label":"gotd/td@9d5d1f3"},"references":[{"type":"WEB","url":"https://github.com/gotd/td/releases/tag/v0.145.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54638.json"},{"type":"ADVISORY","url":"https://github.com/gotd/td/security/advisories/GHSA-whmm-qj9r-wvr2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54638"},{"type":"REPORT","url":"https://github.com/gotd/td/issues/1711"},{"type":"FIX","url":"https://github.com/gotd/td/commit/9d5d1f31ea5022d9798d84ccce15de2e91ba6baa"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-09-12T03:30:31.510790438Z"}}