CVE-2026-54638 json
td has pre-auth denial of service via unbounded memory allocation in proto.UnencryptedMessage.Decode
published 2026-07-28 3 mo ago modified 2026-10-23 16 d ago also GHSA-whmm-qj9r-wvr2 , GO-2026-6138 , EUVD-2026-50085
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 50%
- public exploits
- 0
- none known
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.
Patch / fix
- go github.com/gotd/td 0.145.1
- govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1
suse advisories SUSE-SU-2026:23625-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1
opensuse advisories openSUSE-SU-2026:21761-1
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/gotd/td | <0.145.1 |
0.145.1 |
Affected products
- gotd td
Classification
References
Sources
- CVE List CVE-2026-54638
- GitHub Advisory GHSA-whmm-qj9r-wvr2
- NVD CVE-2026-54638
- OSV GO-2026-6138
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