GHSA-whmm-qj9r-wvr2

Source

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

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-whmm-qj9r-wvr2/GHSA-whmm-qj9r-wvr2.json

JSON Data

https://api.test.osv.dev/v1/vulns/GHSA-whmm-qj9r-wvr2

Aliases

Published

2026-07-28T22:15:28Z

Modified

2026-08-18T17:26:19Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator

Summary

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

Details

Impact

A remote, unauthenticated attacker can cause excessive memory allocation (and resulting CPU / GC pressure, potentially OOM termination) by sending a crafted unencrypted MTProto packet.

(*proto.UnencryptedMessage).Decode read an attacker-controlled 32-bit dataLen field and immediately allocated a buffer of that size via make([]byte, dataLen) before validating that the underlying buffer actually contained that many bytes. A 20-byte packet declaring a ~1.75 GB payload (e.g. dataLen = 0x70000000) forces the runtime to provision and zero-initialize a multi-gigabyte heap allocation before the length is rejected.

Unencrypted messages are part of the unauthenticated MTProto handshake path, so no credentials or established session are required to reach the vulnerable code.

Impact is limited to availability; there is no evidence of memory corruption, out-of-bounds access, or code execution.

Patches

Fixed in v0.145.1 by validating dataLen against the remaining buffer length before allocation (commit 9d5d1f31e).

Workarounds

Upgrade to v0.145.1 or later. There is no in-process workaround for affected versions short of avoiding exposure of the unauthenticated MTProto parsing path to untrusted peers.

Database specific

{
    "cwe_ids": [
        "CWE-770",
        "CWE-789"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-28T22:15:28Z",
    "nvd_published_at": null,
    "severity": "HIGH"
}

References

Affected packages

Go / github.com/gotd/td

Package

Name: github.com/gotd/td; View open source insights on deps.dev
Purl: pkg:golang/github.com/gotd/td

Affected ranges

Type: SEMVER
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.145.1

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/07/GHSA-whmm-qj9r-wvr2/GHSA-whmm-qj9r-wvr2.json"